Polycauliona phlogina, Caloplaca phlogina Teloschistaceae
Polycauliona phlogina (Caloplaca phlogina)

Growth type crustose. Photograph left identified by B Edwards
Chemical results: Thallus and soredia K-. Apothecia K+ red

Rare and declining on nutrient-rich bark of deciduous trees, mainly found on mature Elm and Sycamore. BLS conservation evaluation: NE ?NS

Thin, smooth thallus, whitish-green to greenish-yellow thallus with circular pale greenish-yellow soralia. Apothecia with yellow discs, often white-pruinose, margin often esoridiate. Asci 8-spored, spores (9-)10-13 x 4-7 Ám, the septum 3-4(-6) Ám wide. Microscope photographs below.

The orange apothecia in left photo are Caloplaca ulcerosa


Polycauliona phlogina, Caloplaca phlogina

Polycauliona phlogina, Caloplaca phlogina

Microscope photographs
Caloplaca phlogina

Caloplaca phlogina
Polycauliona phlogina, Caloplaca phlogina
Upton Park and Broadstone, Dorset. January 2013, January 2024

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