Dothideomycetes » Dothideomycetes, genera incertae sedis

Coccodothis

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

 

Coccodothis Theiss. & Syd., Annls mycol. 12(3): 271 (1914)

Saprobic or parasitic on living leaves of Juniperus sp. Sexual morph: Ascostromata solitary, superficial to semi-immersed, epiphyllous, rarely hypophyllous semiorbicular to pulvinate, black. Peridium composed of isodiametric to polyhedric, dark brown, thick-walled cells. Presence of 3–4 loculi per ascostroma, separated from each other by a wall, composed of elongated, thick-walled, brown cells. Paraphyses hyaline, septate, becoming wider at their apices forming an epithecium. Asci bitunicate, fissitunicate, claviform, 8-spored with a distinct ocular chamber. Ascospores bi- to tri-seriate, 1-septate and constricted in their lower third, at first hyaline and covered by a mucous sheath, becoming brown with maturity, upper cell globose, lower cell nearly globose, wall smooth to slightly verrucose. Asexual morph: Undetermined.

 

Type species Coccodothis sphaeroidea (Cooke) Theiss. & Syd.

 

Notes – The monotypic genus Coccodothis was introduced by Theissen & Sydow (1914) for the type species Coccodothis sphaeroidea (= Dothidea sphaeroidea Cooke 1878). The characters of the genus are epiphyllous ascostromata, peridium of isodiametric thick walled cells of textura angularis, claviform, bitunicate, 8-spored asci and one-septate brown ascospores. Muller & Sanwal (1954) placed the genus Coccodothis in the Patellariaceae, based on its similarity to the genus Karshchia Koerb. However, Coccodothis differs from this genus by its clearly formed hypostroma and a hymenium which is divided into several parts. Petrak (1954) included the genus in Polystomellaceae, whereas Muller & von Arx (1962) suggested its inclusion in the Parmulariaceae based on its parasitic lifestyle. Hyde et al. (2013) excluded the genus Coccodothis from Parmulariaceae and accepted it as a genus in Dothideomycetes, genera incertae sedis (Wijayawardene et al. 2014). Cultures and sequences are unavailable. We re-studied the isotype specimen of Coccodothis sphaeroidea from S herbarium under the code S-F51270 and illustrate the morphological characters of the genus. The species lack sequence data. We therefore, retain the genus in Dothideomycetes, genera incertae sedis.

 

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