Anisomeridium biforme

Ascomycota › Dothideomycetes › Monoblastiales › Monoblastiaceae › Anisomeridium

Description

A whitish to pale-grey crust, sometimes outlined by a dark boundary. Numerous black, partly immersed perithecia appear as rounded dots, typically about 0.3–0.4 mm across.

Source: ITALIC — Anisomeridium biforme

Chemistry

Thallus: K−, C−, KC−, P−, UV−. No characteristic lichen substances are reported.

Source: ITALIC — Anisomeridium biforme

Habitat and Substrate

Occurs on the bark of broad-leaved trees in humid woodland and sheltered open places.

Source: ITALIC — Anisomeridium biforme

Similar Species

Compare Anisomeridium polypori and Acrocordia gemmata. A. polypori generally has smaller perithecia; A. gemmata has larger perithecia and spores.

Sources: ITALIC; BLS identification revision

How to Identify

Use the Anisomeridium key; measure perithecia and spores and check spore septation.

Source: BLS identification revision

Important Links

ITALIC — description, chemistry and images

British Lichen Society — species account and British distribution

GBIF — taxonomy and global occurrence records

ITALIC — Anisomeridium identification key

Lichens maritimes — species photographs

AFL — alphabetical photographic index (general resource)

Identification Bibliography

Cannon, P., et al. (2023). Perithecial genera I. Revisions of British and Irish Lichens, 37, 1–59.

Nimis, P. L., et al. ITALIC: The Information System on Italian Lichens. Online account: Anisomeridium biforme.

For identification, use the relevant key and compare the microscopic characters and chemical reactions. Photographs alone may be insufficient for closely similar crustose species.