Stylodothis Arx & E. Müll., Stud. Mycol. 9: 11 (1975)
Saprobic on bark and stems. Sexual state: Ascostromata black, immersed, erumpent to superficial, solitary or scattered, gregarious, coriaceous, multiloculate, with four to numerous locules, cells of ascostromata composed of several layers of dark brown cells of textura angularis. Locules globose to subglobose, non-ostiolate. Peridium of locules a single layer heavily or lightly pigmented cells of textura angularis. Hamathecium comprising hyaline, septate, anastomosing pseudoparaphyses, embedded in a gelatinous matrix. Asci 4−8-spored, bitunicate, clavate to cylindrical, pedicellate, rounded at the apex. Ascospores uni or biseriate, sometimes partially overlapping, yellowish-brown to dark brown, 1-septate, rarely 2 or 3-septate, constricted at the primary septum, upper cell wider, ellipsoid to fusiform, lower cell narrow and tapering to rounded base, smooth-walled, sometimes guttulate. Asexual state: Unknown.
Notes: Stylodothis was introduced by Von Arx and Müller (1975) to accommodate Stylodothis puccinioides and Stylodothis indica (Loeffler & S.K. Bose) Arx & E. Müll. Morphologicaly these two species are similar to Dothidea. S. puccinioides has four ascospores in ascus and develops on Buxus sempervirens while S. indica bear eight ascospores sometimes with 2 or 3-septate and grows on Berberidis lycii. Recent phylogenetic analyses by Schoch et al. (2006) show that S. puccinoides is closely related to Dothidea. In the present study Stylodothis is well-supported genus in Dothideaceae with 81/100 % bootstrap support.
Type species: Stylodothis puccinioides (DC.) Arx & E. Müll., Stud. Mycol. 9: 11 (1975).