Pycnothyria of Saprothyrium differ in having a scutellum with obtuse outer strands with globose to subglobose hyaline conidia, and is similar with Sphaerosporithyrium. However, it clusters in a phylogenetically distant clade to clades of Tubakia sensu stricto (Braun et al. 2018). Saprothyrium can be distinguished from all other species of Tubakia sensu stricto by [...]
Tubakia species may form different types of asexual morphs. Pycnothyria with typical scutella are a distinct character of this genus. In addition, sporodochial conidiomata are formed with clusters of conidiogenous cells e.g. on leaf veins as in T. iowensis. Crustose or pustulate pycnidioid conidiomata are formed in several Tubakia species, including T. californica, T. [...]
Sphaerosporithyrium is similar with Paratubakia (Braun et al. 2018) in conidial shape and colour. However, the formation of pycnothyria formed by species of the latter genus differs in pointed tips of hyphal scutellum strands. Sphaerosporithyrium is characterized by hyaline globose-subglobose conidia (Braun et al. 2018).
The conidiomata of convex scutella with radiating threads of cells connected to the substratum of type specimen are similar to other genera of Tubakiaceae. However, the genera having hyaline conidia arranged in a line are excluded from Tubakia sensu stricto. Racheliella saprophytica is characterized by crustose conidiomata and it is different from all other [...]
Paratubakia subglobosoides is phylogenetically related to P. subglobosa as pycnothyria formation is similar. However, they differ in the conidial shape and size and the formation of distinct leaf spots. Furthermore, the culture characteristics of the two species on MEA are quite different, and they are genetically distinct (Braun et al. 2018). [...]
Oblongisporothyrium was introduced by Braun et al. (2018) to accommodate O. castanopsidis (≡ Actinopelte castanopsidis) as the type species. Oblongisporothyrium castanopsidis is similar to Paratubakia subglobosa in having scutellae with inwardly curved margins, hyaline to pigmented conidiogenous cells, and hyaline conidia, however it differs in having oblong conidia (vs. globose to subglobose in T. [...]
Involutiscutellula rubra can be distinguished from all other Tubakia species in having reddish brown colonies and hyphae with pycnothyria which is more or less undulate with involute margin, having, small, cylindrical to oblong bacilliform conidia (Braun et al. 2018).
Apiognomonioides was introduced based on the sexual morph. Kaneko & Kobayashi (1984) showed Apiognomonia as having two celled ascospores in which the upper cell was larger than the basal cell, however, A. supraseptata is distinct in having a smaller upper cell. Subsequently, Harrington & McNew (2018) suggested that A. supraseptata represents the only clearly [...]