Chaetospermum camelliae

Chaetospermum camelliae Agnihothr., Mycopath. Mycol. appl. 16: 115 (1962) 

Saprobic on dead leaves. Sexual morph: undetermined. Asexual morph: Conidiomata 350–600 µm diam., 250–350 µm high, yellowish-brown and waxy when dry, pearl white and gelatinous when moist, astromatic, pycnidial, solitary or gregarious, superficial, globose to subglobose, cupulate or bow-shaped when dry, hemispherical in sectional view, initially closed but dehiscing from the sunken wall at upper part, unilocular, glabrous. Conidiomatal wall 20–70 µm wide, intermixed with host cells at base, composed of thick-walled, hyaline cells of textura intricata to textura oblita in gel. Conidiophores formed from the inner wall layer of the conidiomata, hyaline, short, densely aggregated, septate, branched, smooth. Conidiogenous cells 5–20 × 2–5 µm wide, hyaline, holoblastic, discrete, sympodially arranged, cylindrical to subcylindrical, straight or slightly curved. Conidia 20.6–29 µm × 4.3–8.5 (x = 24 × 5.8 µm; n = 30), hyaline, unicellular, cylindrical to subcylindrical, rounded at both ends, straight or slightly curved, guttulate, smooth, bearing 6.5–20 µm long, tubular, unbranched, flexuous, subpolar, 2–4 appendages at each end.

Material examined: Thailand, Chiang Rai, Doi Mae Selong, on unidentified dead leaves, 13 July 2012, N. Tangthirasunun, NTCL097–3 (MFLU13–0287, epitype, but no conidiomata); ibid., NTCL097–2 (MFLU13–0287, neotype); Venezuela, on wood chips, R.W.G. Dennis, 30 June 1958 (IMI 76076).

Chaetospermum camelliae (MFLU13–0287, neotype) a Herbarium specimen. b–e Appearance of yellowish brown conidiomata on the host. f–h Vertical section of conidiomata. i–k Section of peridium. l–n Conidiogenous cells and developing conidia, o–q Conidia. Scale bars b = 1000 µm, c–h = 200 µm, i–j = 100 µm, k = 50 µm, l–q = 10 µm.