Mytilinidiales » Mytilinidiaceae

Mytilinidion

Mytilinidion Duby, Mém. Soc. Phys. Hist. nat. Genève 16(1): 34 (1861) [1862].

Index Fungorum number: IF 3389; Facesoffungi number: FoF 08101, 23 morphological species (Species Fungorum 2022), 12 species with molecular data.

Saprobic on host. Sexual morph: Hysterothecia superficial, with bases slightly immersed in substrate, separate or in small groups, conchiform, black, usually striate. Asci cylindric. Ascospores ellipsoid, fusoid or elongate, transversely septate, colored. Asexual morph: Unknown (adapted from Vasilyeva 2001).

 Type species: Mytilinidion aggregatum (DC.) Duby

Notes: Saccardo (1883) pointed out that the epithet Mytilinidion is linguistically incorrect and changed it to Mytilidion. Barr (1975) noted that the epithet Mytilinidion had historic priority and hence re-used it instead of Mytilidion. Mytilinidion is characterised by superficial hysterothecia, cylindric asci and ellipsoid, fusoid or elongate ascospores. Mytilinidion differs from similar genera in Mytilinidiaceae in having transversely septate phragmospores or scolecospores. Mytilinidion has four morphological types which are (a) Short squat phragmospores comprising M. acicola, M. resinae, M. decipiens, M. tortile and M. resinicola; (b) Elongate phragmospores, with a spore length to width ratio of 10: 1 or less comprising M. californicum, M. mytilinellum, M. rhenanum, and M. gemmigenum; (c) Fusoid or spindle-shaped spores comprising M. thujarum, M. oblongisporum, and M. andinense; (d) Scolecospores, with a length to width ratio of 20: 1 comprising M. scolecosporum, M. parvulum and M. austral. The scolecosporous taxa previously resided in the subgenus Lophiopsis, a concept accepted by Zogg (1962) but not followed by subsequent authors. In the phylogenetic analysis of Boehm et al. (2009), Mytilinidion and Lophium formed a strongly supported clade within the Pleosporomycetidae. Mytilinidion is morphologically and phylogenetically a well-supported genus in Mytilinidiaceae. Molecular markers available for Mytilinidion are ITS, LSU, SSU, BTUB, RPB2 and TEF-1.

 

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