Dothideomycetes » Dubujianaceae

Dubujiana

Citation: Pem D et al. (2019) Mycosphere Notes 275-324: A morphotaxonomic revision and typification of obscure Dothideomycetes genera (incertae sedis). Mycosphere 10(1), 1115–1246

 

Dubujiana D.R. Reynolds & G.S. Gilbert, Aust. Syst. Bot. 18(3): 282 (2005)

Endophytic, saprobic or pathogenic on leaves. Sexual morph: Undetermined. Asexual morph: Mycelium at first subcuticular, developing onto leaf surface from leaf glands forming scattered to sporadically confluent superficial thalli, circular in outline, composed of a basal layer of flattened, parallel, branching, brown hyphae brown hyphae with setae. Non-hyphopodiate hyphal strands radiate from base of central, raised pycnidium over the basal layer and onto the substrate. Conidiomata wall composed of thick dark-brown walled cells of textura globulosa. Conidiophores densely aggregated, slender, subulate, simple, frequently branched above, reduced to conidiogenous cells, or with 1–2 supporting cells. Conidiogenous cells annellidic, simple, tapering, hyaline, smooth, with percurrent proliferations. Conidia ellipsoidal, fusiform to lunate, hyaline becoming pale brown at maturity, 1-septare, punctate, non-constricted, smooth-walled.

 

Type species Dubujiana glandulifera D.R. Reynolds & G.S. Gilbert

 

Notes – During a study of epifoliar ascomycetes from leaf surfaces in the forests of Queensland Australia, Reynolds & Gilbert (2005) reported the monotypic genus Dubujiana, with Dubujiana glandulifera as the type species, but did not assign the genus to any family. The genus Dubujiana is characterized by raised pycnidium over the basal layer of the substrate, densely aggregated, slender conidiophores, and tapering, hyaline conidiogenous cells giving rise to pale brown, 1-septate punctate conidia. Cultures and sequences are unavailable. The genus Dubujiana resembles species of Asterinaceae and Microthyriaceae in having superficial hyphae, radiating from base of central layer on the substrate. However, it is distinct in having a pycnidial wall which consists of cells of textura globulosa and 1-septate, punctate, non-constricted conidia. We therefore, accommodate the genus Dubujiana in a new family Dubujianaceae based on its epifoliar lifestyle and unique morphological characters.

 

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