Morphology, anatomy and pigmentation are very similar to B. curvispora (see above).
Thallus whitish, rimose; medulla I.
Apothecia sessile, 1.01.5(1.7) mm diam., remaining flat to slightly convex, margin persistent, 0.080.01 mm wide, black. Exciple dark purple-brown [black in thick sections], K+ purple intensifying. Hymenium hyaline to dilute purple-brown, 100–110 µm tall; paraphyses slender, simple or sparingly branched; apices not swollen, overtopping the asci. Asci cylindrical, 7080 × 1012 µm, 8-spored, essentially uniseriately arranged; ascospores shortly fusiform, 3(5)-septate, straight or slightly curved, 1318 × 67 µm. Hypothecium concolorous with exciple.
Pycnidia abundant, immersed, black; wall purplish brown Kħ purple intensifying. Conidia curved or hamate, c. 1720 × 0.7 µm.
Chemistry. Thallus K, C, KC, P, UV+ pale yellow; zeorin by TLC.
Distribution and ecology. So far known only from the holotype collection from non-calcareous volcanic rock on a sea cliff, where it occurred with a Caloplaca, Opegrapha. Rinodina, and Verrucaria spp. Additional collections from these cliffs included Carbonea phaeostoma and Leptogium limbatum.
Notes: Bacidia gallowayi is very similar in most respects to B. curvispora, differing most obviously in ascospore morphology, but also in having a more granular thallus, ascomata with a larger maximum diameter, and a much higher hymenium. Another possible difference is that the paraphyses apices of the B. gallowayi are less swollen, but additional collections are required to test the consistency of this character.
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