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Megaspora verrucosa
Nomenclature
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Family: MegasporaceaeGenus: Megaspora
SUMMARY
Thallus continuous or dispersed in irregular patches of compacted or loosely co-ordinated, coarse confluent inter-connecting granules or tubercles, sometimes obscured by the apothecia; granules white to grey-white, somewhat mottled, swollen, convex or unevenly flattened, surface smooth, roughened or in part (especially near the apothecia), finely scabrid-areolate, tartareous or densely white pruinose. Photobiont chlorococcoid.
Anamorph: not known.
Teleomorph: ascomata apothecia, 0.5-1.5 mm diam., deeply immersed singly or in pairs in coarse thalline warts. Disc 0.2-0.4(-0.7) mm diam., poriform or becoming expanded, grey-black or black, the surface roughened but not pruinose, the disc colour extending outwards over the inner part of the thalline exciple and proper exciple, forming a dark halo around the disc. Thalline exciple like the cortex, with small, dense granular crystals. Photobiont zone without granules; the medulla and area below apothecia also densely granular, not dissolving in K. True exciple thin, colourless or pale straw, of strongly conglutinated vertically aligned hyphae. Epithecium grey-black in part, K+ brownish, non-granular. Hymenium 200-250 μm tall, J+ blue. Interascal tissue of paraphyses, richly branched and anastomosing, not swollen at the apices, strongly conglutinate. Asci Biatora type, 200-230 × 45-50 μm, clavate to cylindric-clavate, thin-walled except towards the apex, with a K/I pale tholus, (4-)8-spored. Ascospores (30-)35-50(-60) × (21-)25-39(-42) μm, aseptate, globose to broadly ellipsoidal, hyaline, the wall uniformly 1.5-2.5 μm thick.
Chemistry: no lichen metabolites known.