A Taxonomic Revision of the Genus Endoxyla

The pyrenomycete genus Endoxyla (Ascomycotina, Clypeosphaeriaceae) is revised based on the examination of type and authentic material. Five species, E. macrostoma, E. munkii sp. nov., E. operculata, E. parallela and E. xanthostroma sp. nov., are included and a key to the species is given. Endoxyla macrostoma is designated as holotype. Sixteen species and one variety are excluded from Endoxyla and three species are treated as doubtful. The synonymy of Ceratostomella with Endoxyla is rejected and a new combination Ceratostomella hyalostoma is proposed. The taxonomic position of Endoxyla is discussed. The genus Endoxyla was established by Fuckel (1871) for stromatic species possessing immersed ascomata with stout, apically thickened necks, clavate asci, dark, aseptate ascospores and abundant, filiform paraphyses. He referred three species to the genus; Endoxyla macrostoma Fuckel, Sphaeria parallela Fr. and S. operculata Alb. & Schw. Saccardo (1882) formally combined the latter two species in Endoxyla and described the ascospores of E. parallela as aseptate. He included the genus in the section Allantosporae of the Sphaeriaceae, an artificial assemblage of pyrenomycetes characterized by their allantoid ascospores. Winter (1886) treated Endoxyla as a subgenus of Valsa Fr., which he placed in the Valseae. Ellis and Everhart (1892, 1894) maintained Endoxyla as a separate genus in this family and accepted E. macrostoma with aseptate ascospores, E. parallela with uniseptate ascospores, and four species with phragmosporous ascospores including E. fraxini (Ell. & Ev.) Ell. & Ev. Berlese (1902, 1905) included only species with aseptate ascospores in Endoxyla and transferred E. parallela to Endoxylina Romell. He considered Endoxyla to be related to Cryptosphaeria Grev. Von Hohnel (1915) removed the genus from the Valseae and treated Endoxyla as a subgenus