Description
Morphology, anatomy and pigmentation are very similar to B. curvispora (see above).
Thallus whitish, rimose; medulla I–.
Apothecia sessile, 1.0–1.5(–1.7) mm diam., remaining flat to slightly convex, margin persistent, 0.08–0.01 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, 70–80 × 10–12 µm, 8-spored, essentially uniseriately arranged; ascospores shortly fusiform, 3(–5)-septate, straight or slightly curved, 13–18 × 6–7 µm. Hypothecium concolorous with exciple.
Pycnidia abundant, immersed, black; wall purplish brown Kħ purple intensifying. Conidia curved or hamate, c. 17–20 × 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.

Search for this species on:
Click on a thumb-nail for a full size image.
Use cursor keys, or move mouse to side of image, for next (or previous) image
Thallus
Apothecium
Section
Section in KOH
Thecium
Thecium in KOH
 
Spores