Irish lichens

Leptogium teretiusculum

Order: Peltigerales       Family: Collemataceae

Species: Leptogium teretiusculum

Growth type foliose.
Photos: Over moss on mortared wall and on limestone. Co. Cork and Co. Kerry, Ireland. Specimen below confirmed by John Douglass

Very small thallus of narrow, dark brown or greyish-brown lobes. Long isidia-like extensions develop at margins and apices forming dense cushions to 1cm diameter. Primary squamules become +/- obscured. Apothecia are very rare, urceolate with thick margins.

Found on mature shaded deciduous trees, also on basic rocks, walls and coastal mossy grassland. Chemical reactions negative.

Similar: Leptogium subtile. Usually very fertile, shorter lobes with none or few isidia-like extensions.


Leptogium teretiusculum


Leptogium teretiusculum


Leptogium teretiusculum


Leptogium teretiusculum
Leptogium teretiusculum January 2010

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