Irish lichens

Megalaria pulverea

Order: Lecanorales       Family: Megalariaceae

Species: Megalaria pulverea

Growth type crustose.
Photos: Killarney National Park, Co. Kerry, SW Ireland.
Sterile specimen identified by John Douglass

Thin, +/- evanescent, greyish to blue-grey, granular thallus with grey-green, yellowish-green or bluish soralia. Pycnidia are absent, apothecia rare, flat or +/- convex, black or brownish with paler margins. Ascus 8-spored, spores 1-septate 10-18 x 4.5-6.5 Ám.

On acidic mossy trunks of oak, ash and willow in old, damp woods. Rare on branches, mossy rocks, coastal soil and calluna stems.
K+ yellow, usually P+ red, sometimes P+ faint yellow or P-, UV-

Similar: Megalaria grossa. Thallus: Chemical reactions negative.
Megalospora tuberculosa. K+ yellow, P-, UV-

Megalaria pulverea
Megalaria pulverea November 2009

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