Agaricomycetes incertae sedis » Agaricomycetes incertae sedis


Fibulocoela Nag Raj, Can. J. Bot. 56(13): 1491 (1978)

Basidiomycota, Agaricomycetes incertae sedis

Foliicolous. Sexual morph: undetermined. Asexual morph: Conidiomata stromatic, pycnidial, solitary to gregarious or confluent, subepidermal, deeply immersed in origin, later yellowish brown conidial mass visible in surface view, globose to subglobose in section view, multilocular, gelatinous, glabrous, thick-walled, ostiolate. Ostiole single, oval to cylindrical, centrally located. Conidiomatal wall composed of an outer, hyaline, loose, clamp-bearing hyphae, and an inner densely packed textura intricata to textura epidermoidea. Conidiophores arising from the innermost wall layers of conidiomata, hyaline, branched or unbranched, septate with a clamp connection at each septum, smooth-walled, invested in a thin, non-persistent layer of mucus. Conidiogenous cells hyaline, cylindrical to subcylindrical, terminal, but also lateral when arising from the clamp connections along the length of the conidiophores, smooth-walled. Conidia hyaline, cylindrical to subcylindrical, with rounded apex and slightly truncate base, straight or slightly curved, aseptate, smooth-walled, bearing a single, unbranched, attenuated, tubular, flexuous apical appendage; conidia extruded from conidiomata in long cirrhi.


Type species: Fibulocoela indica Nag Raj, Can. J. Bot. 56(13): 1491 (1978)


Notes: The genus Fibulocoela was proposed by Nag Raj (1978) with F. indica as type species. The genus is characterized by pycnidial conidiomata, branched conidiophores with a clamp connection at each septum and cylindrical to subcylindrical conidia bearing a single apical appendage. Clamp connections in the coelomycetous asexual morph indicate its basidiomycetous affinity. Based on this structure, Nag Raj (1993) designated four coelomycetous genera Cenangiomyces Dyko & B. Sutton, Ellula Nag Raj, Fibulocoela and Pycnovellomyces R.F. Castañeda as Basidiomycota, No teleomorph has been linked to these genera and no sequence data are available. Fibulocoela can be easily distinguished from the other basidiomycetous genera by its conidiomata and conidia. Cenangiomyces has pulvinate to cornute conidiomata with a shallow-cupulate head bearing the conidial hymenium, and cylindrical conidia with tubular appendage at each end (Dyko and Sutton 1980). Ellula has subcylindrical or ellipsoid conidia with pairs of closely spaced eusepta and apical and basal appendages (Nag Raj 1980). Pycnovellomyces has unique conidiomatal features (pycnidial, sessile, more or less globose, with irregularly branched fascicles of intertwined asperate hyphae) (Nag Raj 1989). Fibulocoela is monotypic. To fix the genera concept of Fibulocoela, fresh collections of F. indica will have to be epitypified.


Distribution: Cuba.




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.


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