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Acarospora flavisparsa V. J. Rico & Candan
Nomenclature
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Family: AcarosporaceaeGenus: Acarospora
SUMMARY
Mycobank MB 518279
Thallus areolate to squamulose (subsquamulose), forming dispersed patches of one to few areoles associated with thalli of, among areoles or overgrowing it, Protoparmelia montagnei (Fr.) Poelt & Nimis and occasionally with nearby Dimelaena oreina (Ach.) Norman. Areoles irregular, rounded to angular by pressure, sometimes lobulate, 0.5–3.5 mm in diam, up to 2.25 mm thick, commonly forming a short stipe and becoming squamulose; upper surface yellow to pale yellow or greenish yellow, usually dull, convex to concave, smooth to rough, sometimes fissured; lateral/lower surface ± smooth, yellow-brown to dark brown or carbonized black. Upper cortex paraplectenchymatous, (35–)40–125 µm thick depending on development of areoles, cells usually indistinct, ± globular, in several layers, upper layers brown-yellow pigmented, lower layers hyaline, containing granules of various sizes; syncortex lacking or up to 25 µm; lateral/lower cortex continuous with upper cortex, but with brown or dark brown to commonly carbonized black pigmented upper layers. Algal layer continuous, up to 200 µm, usually uneven lower; photobiont chlorococcoid, cells 6–15 µm in diam. Medulla hyaline to dirty white, continuous with broad to forming stipe attaching tissue. Apothecia immersed, aspicilioid, up to 0.7 mm in diam, 1–8 per areole, sometimes confluent, punctiform to round or irregular; disk brown to red, concave to ± plane, rough. Proper excipulum cupular, surrounded by algae, ± prosoplechtenchymatous, 12–30 µm wide, fan expanding around surface, hyaline to yellowish. Hymenium hyaline to yellowish, 125–250(–300) µm tall; paraphyses 1.5–3 µm wide at the base, up to 4.5 µm at slightly pigmented apices; epihymenium brownish-yellow, coherent, with yellowish granules, up to 20 µm tall. Hypothecium, including subhymenium, hyaline to slightly yellowish, up to 150 µm. Asci clavate, 70–130 × 18–30 µm, more than 100-spored, outer wall K/I + blue, tholus K/I–. Ascospores hyaline, simple, elongate to cylindrical, 4–6.01–7.5 × 1.5–2.78–3.5 µm, long/breath ratio 1.66–3, l/b mean value 2.21 (n = 150). Pycnidia immersed, punctiform, ± spherical, up to 210 µm in diam, ostiole inconspicuous or yellow to red-brown, wall hyaline to yellowish, surrounded by algae. Conidia hyaline, bacilliform, 2.5–5 × 1–2 µm. Spot tests in cortex and medulla: K–, C–, KC–, P–, I–; thallus: UV ± orange. Secondary chemistry: epanorin (major) with or without rhizocarpic acid (traces) (8 TLC, 3 HPLC).