Order: Peltigerales       Family: Collemataceae Enchylium polycarpon (Collema polycarpon) Growth type foliose. Photos: On roadside wall. Corran, the Burren, Ireland. Thank you to Brian Coppins for identification 'Cushion like' thallus when wet of numerous thick, +/- contorted, +/- radiating lobes, usually acending at centre. Numerous terminal apothecia, asci 8-spored, spores 1-3 septate, 18-28 × 6.5-8.5 µm, fusiform with acute apices. Isidia are absent. Occurs on exposed, hard, moist limestone and is often found with Collema multipartum. Most frequent in the Burren, Co. Clare and in west and central Ireland. Chemical reactions negative.

Collema polycarpon. On roadside wall, Corran, Co. Clare. April 2009