Order: Peltigerales Family: Collemataceae
Species: Collema tenax var. vulgare
Photos left and immediately below: On limestone. Carran turlough, the Burren, Ireland. BLS meeting April 2009
Small confluent rosettes of short, chunky, swollen, convex lobes. Strongly attached to substrate. Usually abundantly fertile.
Ascus usually 8-spored, the spores colourless, 3-septate to submuriform, 17-26 x 6.5-7.5 Ám. Micro photos below.
Very common on mortar and damp, basic soil. Most records from western Ireland. Chemical reactions negative.
One of several morphs of Collema tenax, the others are
C. tenax var. ceranoides, rarely fertile, narrow ascending lobes,
and C. tenax var. tenax.