Slideshow image
Bacidia hegetschweileri (Hepp) Vainio
Family: Ramalinaceae
Images
not available
Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus white, bluish white, or ashy, thin, granulose to subleprose. Apothecia tiny, 0.2-0.4 mm, broadly adnate, black; disk persistently flat or becoming convex; margin thin, persistent or not; exciple dark brownish red; hypothecium hyaline or pale roseate; epihymenium intensely red; hymenium hyaline, 1+ blue then darkening; paraphyses coherent, simple or rarely branched, 1-1.5 µm, tips rarely thickened to 3-5 µm; asci clavate; spores 8, 3-5(-8)-septate, attenuate with one end commonly attenuated and the other blunt, spirally contorted or occasionally only slightly curved, 26-43 x 2-3.5 µm.

Reactions: epihymenium and exciple red parts turn violet with K in some specimens; these parts may also turn violet with HN03.

This species grows on the bark of Ulmus, Alnus, Betula, and Populus. It is known from Scandinavia and has been reported from Saskatchewan (Jonescu 1970) and Greenland (without locality) by Darbishire (1909).

Although this species has curved, vermiform spores like Scoliciosporum it is retained in Bacidia because of the simple paraphyses and general ascocarp structure and shape.