Biatora pacifica

The whitish to greenish-grey thallus surface of Biatora pacifica is thick, rough, and crumbling, (tartareous) with warts, and in rare instances forms areoles that are 0.1–0.25 mm in diameter. It lacks a visible hypothallus, as well as the vegetative propagules isidia and soredia. The photobiont partner of the lichen is chlorococcoid (i.e., green algae with a coccoid or spherical shape), with individual algal cells measuring 5–13 μm in diameter. Apothecia are typically abundant and occur singly on the thallus. They are usually about 0.42–0.80 mm in diameter (with an observed maximum of 1.6 mm). The disc is dark grey or olive brown, flat to slightly convex, and roughly the same level as the apothecial margin. Asci contains eight spores and are of the Biatora-type. The ascospores are usually colourless and most lack a septum (rarely, some spores have a single septum), with typical dimensions of 9.6–12.1 by 3.0 –3.5 μm.^[1]

Thin-layer chromatography revealed the presence of an unidentified xanthone compounds in Biatora pacifica Also, an unidentified olive-green pigment is present in the apothecial tissue.^[1]

The authors notes a resemblance to Ivanpisutia oxneri, but that species has smaller ascospores and a different chemistry. They proposed that Biatora pacifica is an esorediate (i.e., lacking soredia) counterpart of Biatora pontica, although this suggestion awaits corroboration with DNA evidence.^[1]

Biatora pacifica grows on the bark of trees, including Abies koreana, A. sachalinensis, Acer mono, Acer palmatum, Quercus crispula, Q. dentata as well as species of Alnus, Magnolia, and Salix. It is distributed along the Pacific coasts of Russia, Japan, and South Korea. In the latter country, it was found at elevations from 700 to 1,600 m (2,300 to 5,200 ft), while in the other locales it has been found at elevations between sea level and 600 m (2,000 ft).