Dothideomycetes » Dothideomycetes, genera incertae sedis

Dermatodothis

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

 

Dermatodothis Racib. ex Theiss. & Syd., Annls mycol. 12(3): 280 (1914)

Saprobic or parasitic on leaves of Symplocos sp. Sexual morph: Pseudothecia epiphyllous, scattered, solitary, or in small groups, gregarious, carbonaceous, subcuticular, hemispheric, postulate, more or less lenticular or conical, single or multiple to a flat, forming leaf spot, dark brown to black sometimes confluent, with superficial mycelial surrounding the pseudothecia. Peridium coriaceous, pseudoparanchymatous, thick-walled, dark-brown, thick in the upper part, becoming thicker towards the basal part of the lateral wall. Hypostroma subcuticular, composed of 1–2 layers of hyaline, palisadely arranged cells. Ascospores fusiform to elliptical, 2-septate, constricted at each septum, hyaline to pale brown. Asexual morph: Undetermined.

 

Type species Dermatodothis javanica Racib.

 

Notes – The genus Dermatodothis was introduced by Raciborsky and afterwards described by Theissen & Sydow (1914, 1915) with D. javanica as the type species. The genus is characterized by epiphyllous pseudothecia, elongate to ovoid, pale brown and 2-transversely septate ascospores. The asexual morph is unknown. Cultures and sequences are unavailable. According to Von Arx and Muller (1975), Dermatodothis belongs to Pleosporaceae in the vicinity of Leptosphaeria Ces. et De Not. However, the genus Dermatodothis differs from Leptosphaeria by the nature of its occurrence on living leaves, the very thick-walled, but relatively small cells of the peridium and by the stromata. We re-examined a specimen of Dermatodothis javanica from CUP herbarium under the code CUP-CH-001276 as the holotype specimen cannot be found. This genus could not be assigned to any family and a new family could not be introduced herein because all morphological characters could not be observed and sequence data are unavailable. We retain the genus in Dothideomycetes, genera incertae sedis. Further studies and new collections are required for this genus.

 

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