Collema durietzii Degel.
Details
Collema durietzii Degel., Symb. Bot. Upsal. 20: 98 (1974)
Nomenclature
Degel.
Degel.
1974
98
ICN
Collema durietzii Degel.
species
Collema durietzii
Classification
Descriptions
Collema durietzii Degel.
Thallus rather large, to 7 cm diam., foliose to subfoliose, rounded to subirregular, adnate to ± ascending lobate, thin, often fenestrate, dark olive-green to blackish, somewhat glossy, without isidia, upper and lower surface smooth. Lobes rather short and broad or ± extended contiguous and imbricate, rather irregularly branched (lobulate) forming dense cushions, lobules 1-3 mm broad, irregular, plane or concave, distinctly canaliculate at first, margin not swollen, ± incised and undulate, giving lichen a very crisp appearance. Apothecia numerous and dense, sometimes crowded, to sparse or even lacking, laminal, submarginal or marginal, sessile, constricted at base 1-1.5(-2) mm diam., disc plane to convex, dark red to blackish, matt, or glossy, epruinose, thalline margin thin, ± entire, smooth or somewhat crenulate or verrucose to granular, not prominent, persistent or disappearing, proper margin thin, pale. Ascospores 4-6 per ascus, polystichous, straight or curved, fusiform to subfusiform or ± broadly acicular, with one end (sometimes both ends) very narrow and strongly extended, straight or curved, 6-celled, not constricted at septa 40-60(-70) × (4.5-)6(-6.5) µm. Pycnidia marginal or submarginal, immersed, globose, 170-200 µm diam.
Taxonomic concepts
Collema durietzii Degel.
Collema durietzii Degel.
Collections
Metadata
cbc61535-9f92-4467-9be4-23b0a8b388af
scientific name
Names_Plants
1 January 2000
19 December 2016