Buellia disciformis
Synonyms
Lecidea parasema var. disciformis Fr., Hafellia disciformis (Fr.) Marbach & H.Mayrhofer
Family
Caliciaceae
Flora category
Lichen – Native
Endemic taxon
No
Endemic genus
No
Endemic family
No
Structural class
Lichens - Crustose
Current conservation status
2018 | Not Threatened | Qualifiers: SO
Brief description
Characterised by the corticolous habit; the thin, grey-white thallus; sessile, black apothecia; and ascospores with slight apical thickenings (Callispora-type), 14–30 × 6–13 μm.
Distribution
South Island: Canterbury (Arthur’s Pass, Hanmer, Lake Lyndon), Southland (South Mavora Lake).
Known also from Great Britain, Europe, Scandinavia, Canary Islands, Socotra, North America and Australia.
Habitat
On bark of native and introduced trees, *Alnus glutinosa, Dracophyllum acerosum, Fuscospora cliffortioides. Often associating on mountain beech bark with the lichens Haematomma alpinum, Miltidea ceroplasta, Ochrolechia etc.
Detailed description
Thallus thin, areolate, white to grey, irregular. Medulla ±amyloid. Apothecia sessile, to 1.5 mm diam., disc black, epruinose, margins usually persistent. Hymenium with oil droplets; epithecium olive-brown to brown. Hypothecium dark-brown. Ascospores Callispora-type, 1-septate, rarely 3-septate, apices somewhat pointed, 14–30 × 6–13 μm. Pycnidia common, conidia subcylindrical, 4–5 × 1 μm.
Chemistry: Thallus K+ yellow; containing atranorin.
Substrate
Corticolous
Attribution
Fact sheet prepared by Marley Ford (12 February 2021). Brief description, Distribution, Habitat, and Features sections copied from Galloway (1985) & Galloway (2007).
References and further reading
Galloway D.J. 2007: Flora of New Zealand: Lichens, including lichen-forming and lichenicolous fungi. 2nd edition. Lincoln, Manaaki Whenua Press. 2261 pp.