Microthecium marchicum (Lindau) Y. Marin, Stchigel, Guarro & Cano comb. nov.

Chaetomium marchicum Lindau, Hedwigia 35: 56. 1896. [Basionym]

≡ Sphaeroderma marchicum (Lindau) Sacc. & P. Syd., Syll. fung. (Abellini) 14: 627. 1899.

Notes.

Microthecium marchicum is characterized by its ostiolate ascomata and citrifrom, smooth-walled ascospores. Its ascospores are similar to those of Mi. geoporae, Mi. hypomyces, Mi. levitum and Mi. zobelii, but all of them produce non-ostiolate ascomata.