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Romjularia lurida (Ach.) Timdal 2007 (redirected from: Mycobilimbia lurida)
Family: Lecideaceae
[Biatora petrii Tuck.,  more]
Romjularia lurida image
Life habit: lichenized, not lichenicolous Thallus: squamulose, attached by the whole lower surface squamules: elongated, deeply lobate, weakly concave to weakly convex, irregularly imbricate, up to 5 mm in diam., without vegetative dispersal units upper surface: pale brown to dark brown, dull, smooth or somewhat wrinkled or cracked, epruinose margin: concolorous with upper side or rarely somewhat darker lower surface: medium brown to dark brown upper cortex: 40-70 µm thick, with a narrow epinecral layer, composed of rather thin-walled, more or less anticlinally oriented hyphae with elipsoid to round lumina, not containing remnants of algae (chlor-zinc-iodine!), not containing lichens substances or calcium oxalate; algal layer: 40-80 mm thick, horizontally continuous photobiont: primary one a chlorococcoid alga, secondary photobiont absent; algal cells 10-15 µm in diam. medulla: white, composed of intricately interwoven hyphae, I-, not containing lichen substances or calcium oxalate Apothecia: marginal, sessile, with a constricted base, up to 1.5 mm in diam., mostly simple, plane and ±distinctly marginate when young, later usually becoming moderately convex and often immarginate disc: dark brown, slightly shiny, epruinose Apothecia margin: blackish brown exciple: annular, pale brown, composed of thick-walled, strongly conglutinated, radiating hyphae epihymenium: brown, K- hymenium: hyaline, I+ blue, 80-100 µm tall; paraphyses: straight, sparingly branched and anastomosing, strongly conglutinated, apical cell slightly swollen; hypothecium: pale brown, strongly conglutinated, not containing lichen substances or calcium oxalate, I- asci: clavate, with a well developed amyloid tholus containing a deeper amyloid tube and lacking an ocular chamber (Porpidia-type), 8-spored ascospores: hyaline, simple, ellipsoid, smooth, 11-14 x 6-7 µm, without a halo Conidiomata: pycnidial, marginal or attached to the lower side near the margin, sessile, globose, black, with a dark brown wall and short-celled, intricately branched conidiophores conidia: pleurogenous, narrowly ellipsoid, 3-6 x 1.5-2 µm Spot tests: all negative Secondary metabolites: none detected. Substrate and ecology: on calcium rich rock and soil in open habitats World distribution: common in temperate parts of Europe and known from North Africa, the Middle East and some scattered localities in North America Sonoran distribution: rare, only known from two collections (Arizona, Chiricahua Mts. and Chihuahua, Barranca del Cobre), both at about 1800 m. Notes: Romjularia lurida is morphologically quite similar to Psora globifera and some other brown Psora species, but differs, e.g., in having an apothecial margin, which is darker than the disc and sessile pycnidia. In Psora, any apothecial margin is paler than the disc and the pycnidia are immersed in the squamules. Psorula rufonigra also have sessile pycnidia, but differs in having smaller, darkedged squamules, uniformly black apothecia and a licheni-Arizona. Subsequently, it has been found in NW Mexico. colous life habit. As the new genus was not available in 2002, the species The species was recognized as occurring in the Sono-was keyed as Lecidea lurida on p. 86 of Vol. 1. ran region by Weber (1963) as a Lecidea species from SE
Thompson, J., 1997. American Arctic Lichens: The Microlichens.
Thallus squamulose, to 3 mm long, becoming erect, dark brown or brown, margins turned under; underside pale; cortex paraplectenchymatous, with upper part brown and with a necrotic layer above; attached by rhizoidal strands. Apothecia to 1.5 mm, red-brown, marginal or laminal, convex; exciple red-brown, paling inward; hypothecium brown; hymenium 65-75 μm, 1+ reddish yellow, turning 1+ blue only after previous treatment with KOH; paraphyses with elongate apical cells; asci clavate; spores ellipsoid, 11-15 x 6-7.5 μm. Pycnidia sessile.

Reactions: exciple and epihymenium HC1+ red, K-.

Contents: no lichen substances.

This species grows on soil, preferably calcareous soil. It occurs in Europe and North America. In the latter it is rarely collected. The range is uncer-hymenium 60-80 μm. hyaline; paraphyses 2-2.5 μm, tips 5-6 μm and heavily pigmented; asci clavate; spores with swellings to each side of porus, Buellia-type, septum prominent, 10-15 x 6-8.3 μm.

This species grows on siliceous rocks, sometimes on other lichens. It is known from northern Europe and rarely in the American Arctic.