Name: Oligoporus balsameus (Peck) Gilb. & Ryvarden
Most Confident Observations:
Copyright © 2018 Dusty Yao
Version: 7
Previous Version 

First person to use this name on MO: Nathan Wilson
Editors: Erlon Bailey, Chaelthomas


Domain: Eukarya

Kingdom: Fungi

Phylum: Basidiomycota

Class: Agaricomycetes

Order: Polyporales

Family: Polyporaceae

Genus: Oligoporus

Notes on Taxonomy: [Edit]

Specimen record #36632
Collected by : 1877
Collection date : aug 1877
Country (state) :
USA location details : Adirondack mountains
Host : Abies balsamea
Substrate details : trunks
Status : Type

Basidiocarps annual, pileate, flabelliform or fan-shaped, with narrowed or resupinate base, fusing together in imbricate groups, often with pleasant meadow-sweet odour when fresh. Pilei 0.5–5 cm long, 2–10 mm thick, dense, covered by a thin cuticle. Upper surface agglutinated, with rough radially oriented hairs and large indistinct zones, at first white or grayish with reddish tints, later dirty brown. Margin sharp, even or only slightly undulate or turning down when drying. Context 0.5–2 mm thick, whitish to pale cream, coriaceous, dense. Tubes 0.5–4 mm thick, fleshy and white to pale ochraceous in fresh condition, hard and brownish when dry, sometimes with indistinct vinaceous- brown stains; pores angular to lacerate, 5–7 per mm, with thin entire or slightly lacerate dissepiments.
Hyphal system monomitic. Contextual hyphae thick-walled, clamped, 6–10 μm wide, mostly unchanging but sometimes inflating and dissolving in KOH,rarely with dichotomously branching protuberances 2–2.5 μm in diam having a very narrow (up to 1 μm) lumina. Trama subparallel, hyphae thin- to distinctly thick-walled (walls 0.5–2 μm thick), densely arranged, 2.5–4.5(5) μm wide, amyloid (reaction weak in most specimens, moderate to strong in specimen Spirin 2338). Crystals absent. Leptocystidia present, conical to bottle-shaped, thick-walled, 18–26 × 6–9 μm, nude or rarely apically encrusted by crystal crown. Basidia clavate, clearly constricted, four-spored, 14–24 × 4–6 μm. Basidiospores ellipsoid, often guttulate, (3.7)3.9–4.7(4.9) × (2.1)2.2–2.5(2.6) μm, inamyloid, slightly thick-walled, plasma cyanophilous. Conidial state known only in vitro (Stalpers 1978, 2000). Type of rot: brown.Note—The identification of O. balsameus is often difficult. Domański et al. (1973) mentioned that O. balsameus is developing forms similar to O. floriformis. This latter differs from O. balsameus in having thin-walled, usually collapsing hyphae in tube trama, and narrowly ellipsoid spores 3.5–4.4 × 1.9–2.5 μm. Another relative, O. cerifluus, has robustly thick-walled hyphae and cylindrical, slightly curved spores with concave ventral side 3.8–5.2 × 2.1–2.7 μm. Both O. cerifluus and O. floriformis are acystidiate polypores.
The variability of O. balsameus proper has been discussed many times (see, for example, Donk 1933; Bondartsev 1953; Domański et al. 1973). The specimens from Israel as well as from Russia, Finland, and Ukraine matchthe descriptions by both European and American mycologists (Kotlaba & Pouzar 1968, Domański et al. 1973, Gilbertson & Ryvarden 1987, Ryvarden & Gilbertson 1993, Niemelä et al. 2004; see also colour picture in Niemelä 2005). However, the contemporary concept of O. balsameus is very wide and, probably, encompasses more than one species. The best character for splitting of Oligoporus balsameus into separate species would be amyloid reaction of cystidia and hyphae (P. Vampola and Z. Pouzar, pers. comm.).
Niemelä et al. (2004) described a new species, Postia balsamina Niemelä & Y.C. Dai, which occurs in boreal forests and has mostly resupinate basidiocarps with large pores (3–4 per mm); the next year Niemelä et al. (2005) transferred it to the genus Oligoporus.
In a recent paper, Spirin & Shirokov (2002) note that, in the old spruce forests of European Russia, O. balsameus grows on dead basidiocarps of Fomitopsis rosea (Alb. & Schwein.) P. Karst. [= Rhodofomes roseus (Alb. & Schwein.) Kotl. & Pouzar]. After a more detailed study, we decided that we were dealing with a separate species, described below as Spongiporus rhodophilus.

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Created: 2007-06-19 01:54:00 CDT (-0500) by Nathan Wilson (nathan)
Last modified: 2018-04-21 13:31:54 CDT (-0500) by Chaelthomas (Chaelthomas)
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