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.,
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