Bacidia subabbrevians (Nyl.) Zahlbr. (1926b: 241)

Gerasimova, Julia V. & Ekman, Stefan, 2017, Taxonomy and nomenclature of seven names in Bacidia (Ramalinaceae, Lecanorales) described from Russia, Phytotaxa 316 (3), pp. 292-296 : 295

Bacidia subabbrevians (Nyl.) Zahlbr. (1926b: 241) ( Fig. 1 )

Lecidea subabbrevians Nyl. (1884: 221) . Type:— RUSSIA. Chukotka Peninsula : “sinus Konyam ad fretum Bering, 64° 50 lat. bor., 173° long. occid. (Greenw.)”, 28–30 July 1879, E. Almquist s. n. (lectotype, designated here: S L4654!); [in Nylander’s handwriting] “Fretum Behring, Konyambay”, undated, E. Almquist s. n. (isolectotype: H-NYL 17446!).

The type material of Bacidia subabbrevians was collected on the Chukotka Peninsula, where it inhabited soil consisting of fine-grained sand and decaying plant or bryophyte parts. B. subabbrevians is closely related to Toninia coelestina (Anzi) Vězda , T. cretica Timdal , and Bacidia illudens (Nyl.) H. Olivier. It differs from all of these species in having larger and more distinctly placodioid squamules, which are closely adnate to the substrate surface (thallus a thick, warted crust of coarse, fused granules in T. coelestina and T. cretica , filmy in B. illudens ). Unlike T. coelestina , ascospores are consistently 3-septate, and somewhat wider than in both T. coelestina and T. cretica (3.5–4 μm). B. subabbrevians is also set apart by the distinct, green pigment hoods over the apices of the paraphyses. Awaiting clarification of generic delimitations in the Ramalinaceae , B. subabbrevians is kept here in Bacidia for the time being.

Figures

FIGURE 1. Lecania graminum and Bacidia subabbrevians, thalli with apothecia. A. L. graminum (TUR-V 20778, isolectotype). B. B. subabbrevians (H-NYL 17446, isolectotype).—Scales = 1.0 mm.