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Page number:631 
Description type:Non-original description 
Description:Drechslera biseptata (Sacc. & Roum.) Richardson & Fraser
Colony characteristics. Colonies (PCA) spreading, grey, velvety.
Microscopy. Conidiophores frequently arising from cushion-shaped, blackish-brown stromata, dark brown, erect, stiff, thick- and smooth-walled, 100-800 ?m high, about 8-14 ?m wide, somewhat narrower near the apex, intermingled with small, flexuose conidiophores. Conidia straight, broadly rounded at both ends, pale to mid brown, 2-3-distoseptate, broadly clavate, 23-33 — 14-17 ?m, smooth-walled to finely roughened.
Differential diagnosis. Drechslera-like species with curved conidia are now classified in Bipolaris (p. 526). Conidia in Bipolaris germinate from polar cells, whereas in Drechslera germ tubes arise from all cells (p. 380).
Pathogenicity. BSL-1. Occurring on stored seeds. A case of sinusitis was reported by Washburn et al. (1988).
References. Ellis (1971), Mouchacca (1988), Sivanesan (1990).
Nomenclature. Helminthosporium biseptatum Saccardo & Roumeguère - Revue Mycol. 3: 56, 1881 ? Drechslera biseptata (Saccardo & Roumeguère) Richardson & Fraser - Trans. Br. Mycol. Soc. 51: 148, 1968 ? Marielliottia biseptata (Saccardo & Roumeguère) Shoemaker - Can. J. Bot. 76: 1560, 1998.
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