Rosellinia abscondita



Rosellinia abscondita Rehm.

Rosellinia abscondita is characterized by small stromata with rounded top, associated with an evanescent subiculum, and light brown ascospores 16-24 x 5.5-8.5 µm with convex sidewalls in face view, slimy caps at both ends and a frequently diagonal germ slit. It was clearly separated from other taxa related to R. mammaeformis by Petrini et al. (1989), based on these features and its marked alpine distribution

Rosellinia abscondita shows affinities with R. nectrioides and R. subsimilis, two species belonging to the subgenus Calomastia with which it shares an alpine distribution. Rosellinia abscondita differs from R. subsimilis and R. nectrioides in having ascospores with convex sidewalls in face view, and particularly from R. subsimilis in lacking cellular appendages on ascospores.

Petrini et al. (1989) report R. abscondita as occuring frequently on herbaceous and woody substrates in subalpine and alpine areas of Europe (Austria, Italy, Norway, Sweden and Switzerland) and North America (Canada). We so far did not collect it in the Pyrénées.,