Mirohelminthosporium K. Zhang, D.W. Li & R.F. Castañeda, gen. nov.

MycoBank number: MB 833028; Index Fungorum number: IF 833028; Facesoffungi number: FoF 11598

Differs from Helminthosporium by its holoblastic and primarily monoblastic conidial ontogeny, and its production of euseptate conidia on the apical conidiogenous cells beside or near the tretic loci.

Type species: Helminthosporium bigenum Matsush. [≡ Mirohelminthosporium bigenum(Matsush.) K. Zhang & al.]

Etymology: Latin, Mirus– meaning wonderful, extraordinary, remarkable + Latin,-helminthosporium, referring to the genus Helminthosporium.

Colonies on CMA medium hairy, brown to dark brown. Conidiophores macronematous, mononematous, unbranched, erect, straight, cylindrical, septate,   smooth,   brown   to   dark   brown.   Conidiogenous   cells biontogenous, sometimes on the same cell: i) polytretic, integrated, mostly intercalary, cylindrical, sometimes terminal with subapical tretic loci and apical blastic loci; ii) monoblastic, integrated, terminal, sometimes with several tretic loci near below the blastic locus on the same cell. Conidia solitary, dimorphic: i) acropleurogenous, mostly pleurogenous, cylindrical, oblong, straight or curved, rounded at the ends, melanized or obscure at the base, distoseptate, smooth, brown to dark brown or black, dry, borne on tretic conidiogenous loci; ii) acrogenous, solitary, cylindrical, clavate to subclavate, attenuate, rounded or obtuse at the apex, truncate at the base, euseptate, smooth, brown to dark brown or black, dry, borne on the apical blastic conidiogenous loci.


  • Helminthosporium bigenum