Name: Postia Fr.
Most Confident Observations:
Version: 5
Previous Version 


First person to use this name on MO: Nathan Wilson
Editors: Peter G Werner, Alan Rockefeller, Joseph D. Cohen

Nomenclature:

Rank: Genus

Status: Accepted

Name: Postia

ICN Identifier: missing

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Author: Fr.

Citation: Hymenomyc. eur. (Upsaliae): 586 (1874)

Deprecated Synonyms: Osteina, Spongiporus

Misspellings: Posita

Classification:
Notes on Taxonomy: [Edit]

There are some fairly complicated nomenclatural and taxonomic issues around this genus. Whether Postia, Oligoporus, or Spongiporus is correct for a particular group of species depends on several issues. Much of this centers around whether the name “Postia” was validly published or not. See Oligoporus for further discussion.

Sources:

Walker J. 1996. An opinion on the validity of the generic name Postia Fries 1874 (Eumycota: Aphyllophorales). Australasian Mycological Newsletter 15(2):23–26.
http://tinyurl.com/ASMJune96

Spirin WA, Zmitrovich IV, Wasser SP. 2006. Oligoporus balsameus: rare Eurasian species plus notes on some related taxa. Mycotaxon 97:73–82.
http://tinyurl.com/spirinetal
abstract: http://www.mycotaxon.com/vol/abstracts/97/97-73.html

These notes come from Cyanosporus McGinty when it was merged with this name:

seems silly to me to break into smaller genera but here we are and its legittimate.

These notes come from Postia duplicata LU-LU SHEN, BAO-KAI CUI & YU-CHENG DAI when it was merged with this name:

Differs from other Postia species by basidiomata with duplex context, color change after bruising, presence of gloeocystidia in the hymenium, and cylindrical basidiospores which are 3.8–5.8 × 1.8–2.5 μm. Type.—CHINA. Zhejiang Prov.: Qingyun County, Baishanzu Nat. Res., elev. 900 m, on rotten angiosperm wood, 14 August

2013, Dai 13411 (holotype, BJFC!; isotype, IFP!).

asidiomata.—Basidiomata annual, pileate, solitary, soft corky and watery when fresh, without odor or taste, becoming corky and light in weight when dry. Pileus flabelliform, projecting up to 3.5 cm, 6 cm wide, 1.6 cm thick at the base. Pileal surface white to cream when fresh, glabrous, becoming cinnamon to reddish brown when bruised or upon drying. Pore surface white when fresh, pale brownish to brown when bruised, becoming reddish brown upon drying; pores irregular, 3–4 per mm; dissepiments thin, entire. Sterile margin narrow, brown, up to 1 mm wide. Context duplex, an irregular black line present, the upper layer soft, grey to olivaceous buff, up to 5.5 mm thick; the lower layer dense, cream to buff, up to 4.5 mm thick. Tubes pale brown, fragile when dry, up to 6 mm long.
Hyphal structure.—Hyphal system monomitic; generative hyphae with clamp connections, IKI–, CB–; tissue unchanged in KOH.
Context.—Generative hyphae hyaline, slightly thick-walled to thick-walled with a wide lumen, frequently branched, loosely interwoven, 4.0–7.0 μm in diam.
Tubes.—Generative hyphae hyaline, thin- to slightly thick-walled with a wide lumen, occasionally branched, interwoven, 2.0–4.0 μm in diam. Gloeocystidia present in the hymenium, hyphoid to narrowly clavate, thin-walled, 26.0–34.0 × 2.0–3.0 μm; cystidioles abundant, fusoid, thin-walled, 21.0–29.0 × 4.5–5.5 μm, basidia clavate, with four sterigmata and a basal clamp connection, 20.0–28.0 × 4.0–5.0 μm; basidioles dominant, in shape similar to basidia, but distinctly smaller.
Spores.—Basidiospores cylindrical, hyaline, thin-walled, smooth, IKI–, CB–, (3.6–)3.8–5.8 × 1.8–2.5(–2.6) μm, L = 4.65 μm, W = 2.05 μm, Q = 2.28–2.41 (n = 60/2).
Additional specimen examined.—Postia duplicata: CHINA. Yunnan Prov.: Lanping County, Tongdian, Luoguqing, elev. 1700m, on stump of Pinus, 19 September 2011, Cui 10366 (paratype, BJFC!).

rphologically, P. duplicata is characterized by pileate basidiomata with reddish brown pore surface when bruised, duplex context, narrowly clavate to hyphoid gloeocystidia and cylindrical basidiospores which are 3.8–5.8 × 1.8–2.5 μm. Phylogenetic analysis based on the ITS rDNA sequences (Fig. 3) showed that the two samples of P. duplicata formed a distinct lineage with strong support (100 % MP, 1.00BPP), and confirmed the placement of the new species in the genus.
Phylogenetically, P. duplicata is closely related to P. leucomallella (Murrill) Jülich (Fig. 3). Morphologically, P. duplicata may be confused with P. leucomallella in having pileate basidiomata with brown pileal surface and brown pore surface when dry, similar sized pores (3–4 per mm), and presence of gloeocystidia in the hymenium. However, P. leucomallella differs from P. duplicata in its homogeneous context without a black line and allantoid basidiospores (4.6–6.3 × 1.3–1.8 μm, Niemelä 2005).
Postia fragilis (Fr.) Jülich resembles P. duplicata in having annual and pileate basidiomata with brown pore surface when dry, but it is distinguished in its homogenous context, smaller basidiospores (3.9–5.1 × 1.7–2.1 μm), and lack of gloeocystidia (Niemelä 2005). Moreover, the two species are different in the ITS rDNA-based phylogenetic analysis (Fig. 3).
Postia gloeocystidiata Y.L. Wei & Y.C. Dai also produces gloeocystidia in the hymenium, but it differs from P. duplicata by having unchanged pore surface when bruised and narrowly cylindrical to allantoid basidiospores (3.7– 4.5 × 1–1.1μm, Wei & Dai 2006).
Postia amara (Hedgc.) M.J. Larsen & Lombardand, P. cana H.S. Yuan & Y.C. Dai and P. japonica Y.C. Dai & T. Hatt. also have annual growth and pileate basidiomata with pore surface that darken in varying degrees when bruised. However, P. amara differs from P. duplicata in its tomentose to short hispid pileus, larger pores (1–3 per mm), and bigger basidiospores (6.0–8.5 × 3.5–4.5 μm, Larsen & Lombard 1986); P. cana is distinct from P. duplicata by its imbricate basidiomata with clay pink to fawn pileal surface and allantoid basidiospores (4.0–4.8 × 1.0–1.2 μm, Yuan et al. 2010); P. japonica separates from P. duplicata by imbricate basidiomata, dimitic tramal hyphae and ellipsoid basidiospores(4.5–5.5 × 3–3.5 μm, Dai & Hattori 2007).
Postia balsamea (Peck) Jülich produces pileate basidiocarps with brown pore surface and similar cylindrical basidiospores; however, it differs from P. duplicata by having imbricate basidiocarps with pale brown pileal when fresh, smaller pores (4–6 per mm) and thick-walled, fusiform cystidia in the hymenium (Gilbertson & Ryvarden 1985).
Postia lowei (Pilát ex Pilát) Jülich can be confused with P. duplicata in having annual basidiocarps with brown pileal surface and brown pore surface when dry, both species have similar pores (3–4 per mm) and basidiospores. However, P. lowei differs from P. duplicata by its homogeneous context, absence of gloeocystidia in hymenium, and the color of its pore surface keep unchanged when bruised (Gilbertson & Ryvarden 1985, Jülich 1982). In addition, Postia lowei is distinct from P. duplicata in the ITS-based phylogeny (Fig. 3).
Postia is an important genus belonging to the antrodia clade which produces a brown rot (Ortiz-Santana et al. 2013). Many phylogenetic studies were focused on different genera in the antrodia clade (Kim et al. 2003, 2005, 2007, Yu et al. 2010, Rajchenberg et al. 2011, Bernicchia et al. 2012, Zhou & Wei 2012, Cui 2013, Cui & Dai 2013, Li & Cui 2013a, Li et al. 2013, Ortiz-Santana et al. 2013), however, the phylogenetic analysis on Postia was limited (Hattori et al. 2010, Pildain & Rajchenberg 2013). In the present study, a new species of Postia was described based on morphological features and molecular data, and phylogenetic relationship of species belonging to Postia was analyzed based on ITS sequences. A fully resolved phylogeny for Postia and its related genera requires evolutionary information from more samples and more conserved gene markers.
Key to species of Postia in China 1. Basidiocarps effused-reflexed, pileate or stipitate ………………………………………………………………………………………………….. 2 1. Basidiocarps resupinate…………………………………………………………………………………………………………………………………….. 24 2. Basidiocarps stipitate or substipitate …………………………………………………………………………………………………………………….. 3 2. Basidiocarps effused-reflexed or pileate ……………………………………………………………………………………………………………….. 4 3. Pores 1–3 per mm ………………………………………………………………………………………………. P. subundosa Y.L. Wei & Y.C. Dai
3. Pores 3–5 per mm ……………………………………………………………………………………….P. ceriflua (Berk. & M.A. Curtis) Julich 4. Basidiocarps with distinct grey to bluish tints ……………………………………………………………………………………………………….. 5 4. Basidiocarps white, cream, yellowish or brown ……………………………………………………………………………………………………. 7 5. On angiosperm wood …………………………………………………………………………………………………… P. alni Niemelä & Vampola 5. On gymnosperm wood ……………………………………………………………………………………………………………………………………….. 6

6. Basidiospores < 1.8 um wide …………………………………………………………………………………………. P. caesia (Schrad.) P. Karst. 6. Basidiospores > 1.8 um wide …………………………………………………………………………………… P. luteocaesia (A. David) Julich 7. Basidiocarps becoming brown when bruised or when dry ………………………………………………………………………………………. 8 7. Basidiocarps unchanged when bruised or dry ……………………………………………………………………………………………………… 11 8. Gloeocystidia present ………………………………………………………………………………………………………………………………………… 9 8. Gloeocystidia absent ………………………………………………………………………………………………………………………………………… 10 9. Context duplex ………………………………………………………………………………………………………………. ………………….. P. duplicata 9. Context homogeneous ……………………………………………………………………………………………………………………P. leucomallella 10. Basidiospores < 1.6 um wide ……………………………………………………………………………………………………… P. lateritia Renvall 10. Basidiospores > 1.7 um wide …………………………………………………………………………………………………………………… P. fragilis 11. Basidiocarps chalky when dry ………………………………………………………………………………….P. calcarea Y.L. Wei & Y.C. Dai 11. Basidiocarps fragile, corky or woody hard when dry ……………………………………………………………………………………………. 12 12. Cystidia present ……………………………………………………………………………………………………………………………………………….. 13 12. Cystidia absent ……………………………………………………………………………………………………………………………………………….. 15 13. Cystidia thin-walled ………………………………………………………………………………………………. P. amurensis Y.C. Dai & Penttilä 13. Cystidia thick-walled ……………………………………………………………………………………………………………………………………….. 14 14. Cystidia amyloid in Melzer’s reagent ……………………………………………………………P. pileata (Parmasto) Y.C. Dai & Renvall 14. Cystidia inamyloid in Melzer’s reagent ……………………………………………………………………………………………….. P. balsamea 15. Pores bigger, 1–3 per mm ……………………………………………………………………………………………………. P. undosa (Peck) Julich 15. Pores smaller, > 3 per mm…………………………………………………………………………………………………………………………………. 16 16. Gloeocystidia present ……………………………………………………………………………………………………………………………………….. 17 16. Gloeocystidia absent ………………………………………………………………………………………………………………………………………… 18 17. Hyphal pegs abundant …………………………………………………………………………………………………………………. P. gloeocystidiata 17. Hyphal pegs absent ……………………………………………………………………………………………….. P. qinensis Y.C. Dai & Y.L. Wei 18. Pileal surface more or less pink when fresh………………………………………………………………………………………………………… 19 18. Pileal surface never pink when fresh ………………………………………………………………………………………………………………….. 20 19. Basidiospores > 1.5 μm wide ………………………………………………………………………………….. P. persicina Niemelä & Y.C. Dai 19. Basidiospores < 1.5 μm wide ………………………………………………………………………………………………………………………P. cana 20. Pileal surface zonate…………………………………………………………………………………………………….P. zebra Y.L. Wei & Y.C. Dai 20. Pileal surface azonate……………………………………………………………………………………………………………………………………….. 21 21. Basidiocarps mild, upper surface greyish brown …………………………………………………………………. P. tephroleuca (Fr.) Jülich 21. Basidiocarps bitter, upper surface cream or yellow-brownish………………………………………………………………………………… 22 22. Basidiospores > 2 μm wide ……………………………………………………………………………………………… P. guttulata (Sacc.) Jülich 22. Basidiospores < 2 μm wide ……………………………………………………………………………………………………………………………….. 23 23. Basidiocarps woody hard when dry ……………………………………………………………………………………….P. stiptica (Pers.) Jülich 23. Basidiocarps fragile when dry……………………………………………………………………………………………….. P. lactea (Fr.) P. Karst. 24. Basidiocarps becoming reddish to rusty brown when bruised………………………………………………………………………P. lateritia 24. Basidiocarps unchanged when bruised ……………………………………………………………………………………………………………….. 25 25. Basidiospores mostly > 2 μm wide …………………………………………………………………………………………………………………….. 26 25. Basidiospores mostly < 2 μm wide …………………………………………………………………………………………………………………….. 30 26. Cystidia present……………………………………………………………………………………………………… P. sericeomollis (Romell) Jülich 26. Cystidia absent ……………………………………………………………………………………………………………………………………………….. .27 27. Basidiocarps salmon pink; basidiospores 2–3 μm wide…………………………………..P. placenta (Fr.) M.J. Larsen & Lombard 27. Basidiocarps white or cream; basidiospores 2–2.5 μm wide ………………………………………………………………………………….. 28 28. Basidiocarps with rancid smell …………………………………………………………………. P. rancida (Bres.) M.J. Larsen & Lombard 28. Basidiocarps without rancid smell …………………………………………………………………………………………………………………….. 29 29. Basidiocarps very large, gloeopleurous hyphae present ……………………………………………… P. obliqua Y.L. Wei & W.M. Qin 29. Basidiocarps small, gloeopleurous hyphae absent ………………………………………………………………….. P. subplacenta B.K. Cui 30. Cystidia thick-walled ………………………………………………………………………………….P. pileata (Parmasto) Y.C. Dai & Renvall 30. Cystidia thin-walled …………………………………………………………………………………………………………………………………………. 31 31. Pores 5–6 per mm; basidiospores mostly < 1 μm wide ……………………………………………………………. P. simanii (Pilát) Jülich 31. Pores 3–4 per mm; basidiospores mostly > 1 μm wide ……………………………………….. P. hibernica (Berk. & Broome) Jülich

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