A new vagrant lichen Circinaria rostamii Sohrabi was described from the semi‐arid steppes in Northwest Iran | MYCO-LICH

A new vagrant lichen Circinaria rostamii Sohrabi was described from the semi‐arid steppes in Northwest Iran


Thallus vagrant, lumps formed of folded lobes, brainshaped, subspherical, rounded, amorphous, occasionally flat, variable in size, 0.5–2.5 cm tall, 0.5–2(–3) cm wide. Surface even, more or less rimose, with shallow to deep cracks, dull brown, brownish grey to greyish green, sometimes whitish grey, pale olive-brown to pale brown, sometime reddish brown (when ferriferous  sediments are present in soil). Pseudocyphellae very common, ±white, dot-like, usually visible on areole-like lobes. Cortex indistinctly delimited, one layer, (40–)60–90(–110) μm thick,  paraplectenchymatous, ± brown, cells (4–)5–7(–8) μm in diam., inner part indistinct, mixed with prosoplectenchymatous tissue of medulla sometimes forming distinct layer of (30–)40–80(–90) μm thick, (floating of algal cells in the medulla make it uneven, without distinct margin to distinguish it from the real cortex). Epinecral layer 1–10(–18) μm thick. Photobiont chlorococcoid, cells 5–22 μm in diam., clustered in small groups, each group up to 80–180×50–110 μm wide. Medulla white, I–, containing crystals of calcium oxalate. Apothecia aspicilioid, rare, up to 0.5–1.5 (–2.5) mm wide, often among the lobes in older parts of the thallus. Disc black to brown-black, pruinose, concave to convex when young, becoming more flat when old. Thalline exciple flat to ± elevated and prominent in older apothecia, entire, concolorous with thallus or with a thin to thick white rim. True exciple (40–)50–85(–90) μmwide, ± I + blue, uppermost cell brown, ± globose, 4–5(–7) μm in diam. Epihymenium brownish to dark brown, K + colour fading from brown to light yellowish green, N + pale green (caesiocinerea-green). Hymenium hyaline, occasionally with few oil drops, (95–)115–140(–155) μm tall. Paraphysoids moniliform to submoniliform, with upper cells ± globose, 4–7 μm wide, in lower part 4–8×2–3 μm wide, more or less branched. Hypothecium and subhymenium pale, (35–)50–65(–85) μm thick, I + blue. Asci broadly clavate,  (80–)90–100(–110)×25–35 μm, with thick apical dome (20–30 μm), 2–4(–5) spored. Ascospores hyaline, simple, globose to subglobose, (16–)19–[22.1]–24 (–26)×(16–)19–[21.6]–23(–25) μm (n=30). Pycnidia usually on top of branches, immersed, single, stretched flask-shaped, internal wall colourless, frequently with black to brownish ostiole. Conidia filiform, straight to very slightly curved (8–)10–12(–16)×1–1.3 μm (n030). Chemistry: All spot-tests (K, C, KC, CK, P) negative both in the cortex and medulla. TLC and HPLC: No substances detected. UV: Negative.