Teloschistaceae Scythioria phlogina (Caloplaca phlogina) Growth type crustose. Photograph left identified by B Edwards Chemical results: Thallus and soredia K-. Apothecia K+ red Previously mainly found on mature Elms but now appears to be increasing and can be found on the base-rich bark of other broadleaved trees and also on lignum and dead plant stems Thin, smooth thallus, whitish-green to greenish-yellow thallus with circular pale greenish-yellow soralia. Apothecia with deep-yellow discs, often white-pruinose, margin +/- esoridiate. Asci 8-spored, spores (9-)10-13 x 4-7 µm, the septum 3-4(-6) µm wide. Microscope photographs below. The orange apothecia in left photo are Caloplaca ulcerosa

Microscope photographs



Scythioria phlogina (Caloplaca phlogina)
Upton Park and Broadstone, Dorset. January 2013, January 2024