Fungalpedia – Note 1485, Collonaemella
Collonaemella. Höhn.
Index Fungorum, Facesoffungi, MycoBank, GenBank, Fig 1
Classification: Dermateaceae, Helotiales, Leotiomycetidae, Leotiomycetes, Pezizomycotina, Ascomycota, Fungi
Saprobic on the host plant in terrestrial habitat. Sexual morph: undetermined. Asexual morph: Conidiomata brown, stromatic, pycnidial, scattered, semi-immersed, subglobose to subconical, unilocular, glabrous, ostiolate. Ostiole cylindrical to subcylindrical, single, centrally located. Conidiomatal wall composed of thick-walled, brown to sub-hyaline cells of textura globulosa. Conidiophores reduced to conidiogenous cells. Conidiogenous cells hyaline, enteroblastic, phialidic, subcylindrical to ampuliform, determinate, smooth-walled, with a minute apical channel and collarttte. Conidia hyaline, fusiform, with acute ends, 1-septate, smooth-walled (Nag Raj and DiCosmo 1984).
Notes: Nag Raj and DiCosmo (1984) emended the description of Collonaemella and treated it as a monotypic genus. Collonaemella was listed as a synonym of Corniculariella in Index Fungorum (2019), but a comparison of their morphology indicates that they are distinct in the structure of conidiomata and conidia. Collonaemella has an inconspicious beaked conidiomata with textura globulosa cells, and fusiform, 1-septate, fusiform conidia (Sutton 1980). Corniculariella has beaked conidiomata with textura angularis to intricata or porrecta cells, and 1–10-septate, fusiform to clavate conidia. Therefore, Collonaemella is treated as a legitimate name. No sexual morph has been linked to this genus, and no molecular data is available.
Type species: Collonaemella microscopica (Fr.) Höhn., Sber. Akad. Wiss. Wien, Math.-naturw. Kl., Abt. 1 124: 82 (1915).
Figure 1 – Collonaemella microscopica (redrawn from Nag Raj and DiCosmo 1978) a Conidia. b Vertical section of conidioma. c Conidiogenous cells and developing conidia.
References
Li WJ, McKenZie EHC, Liu JK, Bhat DJ, Dai DQ, Caporesi E, Tian Q, Maharachcikumbura SSN, Luo ZL, Shang QJ, Zhang JF, Tangthirasunun N, Karunarathna SC, Xu JC, Hyde KD (2020) Taxonomy and phylogeny of hyaline-spored coelomycetes. Fungal Diversity 100: pages279–801.