Crossopsorella E.S.C. Souza, Aime, Galvão-Elias, Dianese, 2018

Souza, Erica S. C., Aime, M. Catherine, Elias, Samuel G., Pinho, Danilo B., Miller, Robert. N. G. & Dianese, José C., 2018, Crossopsorella, a new tropical genus of rust fungi, Phytotaxa 375 (3), pp. 189-202 : 193-195

Crossopsorella E.S.C. Souza, Aime, Galvão-Elias, Dianese , gen. nov.

MycoBank MB823952

Typification: Crossopsorella byrsonimae (P. Henn.) E.S.C. Souza, Aime, Galvão-Elias, Dianese , comb. nov. Etymology: Crossopsorella referring to a genus similar previously established.

Description: Spermogonia subcuticular. Aecia subepidermal, peridium persistent with hexagonal elongated verrucose peridial cells. Aeciospores catenate, verruculose, 1-equatorial germ pore. Uredinia subepidermal in origin, erumpent, usually with slightly curved peripheral paraphyses, showing as segmented when seen under SEM. Urediniospores borne singly, echinulate, pores scattered, obscure. Telia subepidermal in origin, erumpent, forming hair-like columns, brown. Teliospores 1-celled, originated from immerse group of closely set sporogenous cells that form spores in basipetal chain, resulting in a solidly adhered column of thick walled teliospores, showing one lateral germ pore, germinating externally, resulting in 3-septate metabasidia.

Notes: The genus Crossopsorella is established to allocate species previously allocated in Crossopsora , but were shown to be non congeneric with C. ziziphi , the genus type species. The new genus differs from Crossopsora by spermogonia and aecial types. Although both produce Group VI spermogonia, in Crossopsora they are type 7, while spermogonia of Crossopsorella belong to type 5. Crossopsora produces Caeoma - type aecia, whereas in Crossopsorella they are characteristically of the Aecidium - type ( Hennen et al. 2005).