Name: Pleonectria strobi
Author: Hirooka, Rossman & P. Chaverri
Citation: Studies in Mycology 71: 169 (2012) [MB#519720]
Preferred Synonyms:Thyronectria strobi (Hirooka, Rossman & P. Chaverri) Jaklitsch & Voglmayr
Teleomorph in natural environment: Perithecia and pycnidia sometimes formed on same or discrete stroma. Mycelium not visible around perithecia or on host. Stromata erumpent through epidermis, 0.5–1.0 — 0.5–1.0 mm, orange to sienna, KOH+ dark purple, LA+ yellow, pseudoparenchymatous, cells forming textura angularis, intergrading with perithecial wall. Ascomata superficial on well-developed stroma, scattered to aggregated in groups of 3–17, subglobose to globose, 174–302 µm high — 210–340 µm diam, red to umber, cupulate upon drying, sometimes with only a depressed apical region, apical region slightly darker, KOH+ purple, LA+ yellow, surface usually bright yellow to yellowish green scurfy. Perithecial surface cells forming textura globulosa or t. angularis, sometimes including bright yellow scurf, 3–10 µm diam, with pigmented, uniformly or irregularly, ca 1.5 µm thickened walls. Perithecial wall 30–51 µm thick, of two distinct regions: outer region 25–40 µm thick, intergrading with stroma, cells forming textura globulosa or t. angularis, walls pigmented, about 1.5 µm thick; inner region 7–15 µm thick, of elongate, thin-walled, hyaline cells, forming textura prismatica. Asci narrowly clavate, increasing in size as ascospores mature, 45–112 — 8–12 µm, with inconspicuous ring at apex, 8-spored. Ascospores long-filiform, 12–44 septate, hyaline, (21.8–) 32.9–52.1 (–64.3) — (1.9–) 2.2–3.2 (–3.9) µm (n = 120), smooth, budding to produce hyaline, thin-walled, tapering apex, slightly curved, bacillar ascoconidia, (0.2–) 2.3–3.5 (–3.9) — (0.9–) 1.1–1.9 (–2.3) µm (n = 125), that fill asci.
Anamorph in natural environment: Stromata erumpent through epidermis or developing with perithecia, orange to red. Pycnidia solitary or aggregated in groups of 4–12, superficial on stroma or rarely immersed at base, subglobose, smooth to slightly roughened, cerebriform upon drying, 195–311 µm, 186–468 µm diam, KOH+ slightly darker, LA+ slightly yellow. Pycnidial wall 19–33 µm thick, of two distinct regions: outer region 10–23 µm thick, intergrading with stroma, cells forming textura globulosa, walls pigmented, about 1.0 µm thick; inner region 8–14 µm thick, of elongate, thin-walled, hyaline cells, forming textura prismatica. Conidiophores densely branched, generally with 1–3 branched, 12–27 µm long, 1.3–2.5 µm wide. Conidiogenous cells cylindrical to subulate, straight to slightly curved, enteroblastic, monophialidic, 8–12 — 1.0–2.0 µm. Intercalary phialides bearing (1–)3 terminal phialides, up to 5 µm long, similar to short acropleurogenous conidiophores. Sterile hyphae absent. Conidia hyaline, ellipsoid to oblong, sometimes slightly curved, non-septate, (1.9–) 2.6–3.4 (–3.8) — (1.1–) 1.2–1.6 (–1.8) µm (n = 100).
Anamorph in culture: After 7 d at 25 ?C, colonies70–85 mm (average 78.6 mm) diam. Colony surface cottony with aerial mycelium, whitish brown; aerial mycelium often sparse, white to whitish, yellow, sporodochial conidial masses produced after three weeks; reverse whitish brown. Odour on PDA slightly putrid. Sporulation on SNA from lateral phialidic pegs abundant, enteroblastic, monophialidic, ellipsoid to cylindrical, tapering toward tip, 2.2–4.0 µm long, 1.1–1.9 µm wide at base. Conidiophores formed, unbranched, sometimes 1(–2) branched, becoming loosely to moderately densely branched, 9.6–30.5 µm long, 1.5–2.3 µm wide at base. Conidiogenous cells monophialidic, enteroblastic, cylindrical, slightly tapering toward tip or narrowly flask-shaped with widest point in middle, 7.0–11.1 µm long, 1.4–2.1 µm wide at base. Young conidia formed from monophialides on aerial, submerged, or trailing hyphae, formed abundantly on slimy heads or sporodochia, ellipsoid to oblong, hyaline, straight or slightly curved, rounded at both ends, non-septate, (3.5–) 3.8–4.6 (–5.1) — (1.1–) 1.3–1.7 (–2.0) µm (n = 118), smooth-walled. Mature conidia swollen, non-septate, oblong with slightly swollen at both ends or sometimes long-cylindrical, hyaline, smooth, slightly curved, rounded at both ends, (7.1–) 7.5–9.5 (–12.5) — (1.3–) 1.5–2.1 (–2.4) µm (n = 50). Chlamydospores, pycnidia and perithecia not produced in culture.
Taxon name: Pleonectria strobi
Taken from: http://www.mycobank.org/...
Jaklitsch, W. M., & Voglmayr, H. (2014). Persistent hamathecial threads in the Nectriaceae, Hypocreales: Thyronectria revisited and re-instated. Persoonia: Molecular Phylogeny and Evolution of Fungi, 33, 182.
Created: 2016-04-02 12:18:07 CDT (-0400) by Thomas Laxton (Tao)
Last modified: 2018-11-12 15:23:03 CST (-0500) by Django Grootmyers (Heelsplitter)
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