Verrucaria depressula Servit , nom. nov., Stud. Bot. Cechoslov . 9: 80, 1948
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https://dx.doi.org/10.3897/mycokeys.72.56223 |
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https://treatment.plazi.org/id/83DD907A-0E16-54B6-9A19-010049FC54D5 |
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Verrucaria depressula Servit , nom. nov., Stud. Bot. Cechoslov . 9: 80, 1948 |
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Verrucaria depressula Servit, nom. nov., Stud. Bot. Cechoslov. 9: 80, 1948
= Verrucaria depressa Stenhammar, nom. illeg. non Meyen & Flot., Öfvers. K. Svensk. Vetensk.-Akad. Förhandl. 14: 120, 1857. Type. Sweden, Gotland, Lojsta, Lojsta, in collybus calcareis, 1846-55, C. Stenhammar (H!, two syntypes)
= Verrucaria obscura Th. Fr., nom. illeg. non (Sm. & Sowerby) Borrer 1836, Öfvers. K. Svensk. Vetensk.-Akad. Förhandl. 21: 276, 1865. Type. Sweden, Resmo, C. Stenhammar (UPS!, syntype)
Description.
Prothallus not seen. Thallus grey, pale brown, medium brown or rarely dark brown, with a violet tinge, continuous, rimose or areolate, thallus colour may be variable within specimen, 0.05-0.2(-0.3) mm thick, contiguous conspecific thalli separated by dark lines. Perithecia 0.26-0.52 mm, (1/2-)3/4-immersed, leaving shallow to deep pits in the rock; ca. 60-120 perithecia/cm2. Involucrellum apical, strongly diverging from the exciple (mainly spreading outwards away from the exciple), (40-) 50-90 μm thick. Exciple 0.25-0.4 mm in diameter, pale or dark. Periphysoids ca. 40-60 × (1-)1.5-2 μm. Ascospores 0-septate, (24-)27-35(-45) × 10-18(-20) μm, few spores 1-septate.
Notes.
Based on morphology, V. depressula may belong to the Thelidium group or perhaps more probably be related to V. viridula . The type locality is in Sweden and rather close to Finland, but nevertheless, no specimens fitting with V. depressula have been found from Finland.
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