Helotiales » Lachnaceae » Crucellisporium

Crucellisporium africanum

Crucellisporium africanum Nag Raj, Can. J. Bot. 56(6): 713 (1978)

 

 

Foliicolous. Sexual morph: undetermined. Asexual morph: Conidiomata 100–150 µm diam., 80–100 µm high, olive-brown, stromatic, acervular, inconspicuous, mostly epiphyllous, solitary to gregarious, immersed at first, becoming erumpent at maturity, rounded in outline. Conidiomatal wall 10–30 µm wide, well developed, partly immersed, composed of textura globulosa with cells thick-walled, red-brown in the lower layers, and gradually merging with small, almost hyaline, thick-walled cells of textura prismatica in the upper layers, and surrounded by a sheath of sterile hyphae. Sterile hyphae pale brown in the basal part, becoming hyaline above, cylindrical, with a blunt or rounded apex, unbranched, 3–5-septate, smooth-walled. Conidiophores arising from the upper layers of basal wall, hyaline, short, branched or unbranched, septate, smooth-walled (Nag Raj 1993). Conidiogenous cells hyaline, subcylindrical to clavate, discrete or integrated, indeterminate, smooth-walled. Conidia hyaline, mostly tetra-radiate, occasionally tri-radiate; main axis 9–26 × 1–3 µm ( = 18 × 2 µm; n = 20), subcylindrical to clavate, with a narrow and truncate base, straight or slightly curved, 1-septate, cells unequal, smooth-walled, bearing a tubular, unbranched, excentric, attenuated appendage; arms 12–34 × 1–2.4 µm ( = 28 × 1.6 µm; n = 30), two or three, subcylindrical, attenuated, 1-septate, not constricted at septa, arising at apex of the main axis from different loci and delimited from it by septa.

 

Material examined: Tanzania, Tanganyika, Kigoma, Mkenke, on leaves of Dalbergia lactea (Fabaceae), 26 January 1964, K. Pirozynski (IMI 106429(d), type).

 

 

Crucellisporium africanum (IMI 106429(d), type) a–c Herbarium specimen and slides. d–e Vertical section of conidiomata. f–g Section of peridium. h–i, k–m Conidia. j Sterile hyphae. Scale bars d–e = 50 µm, f–g, j = 20 µm, h–i, k–m = 10 µm.

 

 

References:

 

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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