ITALIC 8.0

Myriospora dilatata (M. Westb. & Wedin) K. Knudsen & Arcadia

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Distribution:

Description: Thallus crustose, episubstratic, areolate, the areoles rounded to angular, contiguous to dispersed, the fertile ones (0.4-)0.7-1.3(-1.6) mm wide, orange to dark rusty red, flat to convex. Epinecral layer absent; upper cortex without crystals, 15-35 μm thick, overlain by 5-15 μm thick layer of golden red, granular crystals; algal layer more or less regular, but most often interrupted by thin medullary strands. Apothecia 1-3(-5) per areole, immersed, round, 0.2-0.4(-0.6) mm across, with a mostly black, sometimes rusty red-pruinose flat, disc surrounded by a thalline margin. Proper exciple colourless or somewhat yellowish in section, sometimes brownish in parts, widening to up to 125 μm in upper part; epithecium red-brown to dark brown, sometimes with dark rusty-red, granular crystals; hymenium colourless, 130-175 μm high; paraphyses simple or sparingly branched in upper part, (1-)1.5-2 μm thick at mid-level, the apical cells clavate, 2-4 μm wide; subhymenium colourless to pale brown, with many oil drops, up to 100 μm high. Asci >100-spored, narrowly clavate, the apical dome K/I-. Ascospores 1-celled, hyaline, narrowly ellipsoid, 3-4 x 1-1.5 μm. Photobiont chlorococcoid. Spot tests: cortex and medulla K-, C-, KC-, UV-. Chemistry: without lichen substances.

Note: a species of iron-rich, sometimes weakly calciferous siliceous rocks, often found near rivers and lakes but not periodically submerged, known from Scandinavia, Germany and the Czech Republic. Its occurrence in the Italian Alps cannot be excluded. However, according to Westberg & al. (2011), forms resembling M. dilatata do occur in the Alps, but preliminary DNA data from one specimen suggest that these may belong to a different, perhaps undescribed, cryptic species.

Growth form: Crustose

Substrata: rocks

Photobiont: green algae other than Trentepohlia

Reproductive strategy: mainly sexual

Species of metal-rich rocks

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Eutrophication:

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Poleotolerance:

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Altitudinal distribution:

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Predictive model

Einar Timdal - Source: http://www.nhm2.uio.no/botanisk/lav/Photo_Gallery/Myriospora/dilatata_G=Norway+Moere-og-Romsdal+Rindal_H=O-L-158511_C=ET_I=1.jpg

Einar Timdal - Source: http://www.nhm2.uio.no/botanisk/lav/Photo_Gallery/Myriospora/dilatata_G=Norway+Moere-og-Romsdal+Rindal_H=O-L-158511_C=ET_I=1.jpg