Chaetosphaeriales » Chaetosphaeriaceae » Conicomyces

Conicomyces contortus

Conicomyces contortus Illman & G.P. White, Can. J. Bot. 63(3): 419 (1985)



Corticolous or lignicolous. Sexual morph: undetermined. Asexual morph: Conidiomata up to 700 µm long, stromatic, solitary or gregarious, seemingly superficial and spuriously synnematous, but intra-peridermal in origin and coelomycetous in nature, cornute to subcylindrical, slightly roughened, differentiated into a stalk and a conidiiferous head; stalk up to 500 µm long, 100160 µm wide, black to dark brown for most of its length, becoming paler at upper part, subcylindrical, straight or variously curved, unbranched or branched, thick-walled; head 200500 µm diam., 100400 µm wide, slightly swollen, ellipsoidal or depressed globose, bearing a concave conidial hymenium, often with a pointed tip or sometimes flattened above, sparsely setose. Wall of stipe and hymenium composed of thick-walled, brown to pale brown cells of textura intricata to textura porrecta. Conidiomatal setae brown at base, becoming paler and narrower above, scant, septate, unbranched, thick-walled. Conidiophores up to 60 µm long, pale brown to hyaline, arising in the cavity of the conidiomata, more or less compact, mostly irregularly branched, septate, smooth, invested in mucus. Conidiogenous cells hyaline, enteroblastic, subcylindrical to clavate, discrete or integrated, smooth-walled, with periclinal thickenings above. Conidia 60–80 × 35 µm (x = 70 × 4 µm; n = 30), hyaline, acerose to elongate fusiform, with a narrowed and obtuse apex, and a narrowed and truncate base bearing minute marginal frills, 1019-septate, without constrictions at the septa, indistinct or distinct, straight or slightly curved, thick- and smooth-walled, guttulate, bearing a single, tubular, unbranched, flexuous apical appendage (20–40 µm long).


Material examined: Canada, Ontario, Tarzwell, Boreal forest, on rotten, decorticated branches (probably of Populus tremuloides), 3 October 1980, G.P. White (DAOM 177281, type).


Conicomyces contortus (DAOM 177281, type) a–b Herbarium package and specimen. c–e Appearance of brown conidiomata on the host. f–h, l Conidiomata with stalk and head. i Conidiomatal setae. j–k, o–p Conidiophores, conidiogenous cells and developing conidia (arrows show phialidic conidiogenous cells). m–n Structure of conidiomatal wall. q–v Conidia. Scale bars c–e = 200 µm, f–g= 100 µm, h = 50 µm, i–k = 10 µm, l = 100 µm, m–n = 20 µm, o–p = 10 µm, q–v = 5 µm.






Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.



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