C,f [ 2349 ]
C 0 L L E M A tenax.
Tenacious Collema.
CRYPTOGAMIA Algos,
Gen. Char. Shields orbicular, horizontal, nearly
sessile, superficial, with a gelatinous accessory
border.
Spec. Char. Frond rather glaucous, fleshy, imbricated
; lobes obtuse, somewhat palmate. Shields
depressed, dilated, reddish.
Syn. Lichen tenax. Swartz. Act. Nov. Upsal. v. 4.
249. Ach. Prodr. 128. Act. Nov. Holm. v. 16.9.
f.l. f. 1. Bernh. in Schrad. Journ. fo r 1799.
fasc. 1. 14. t. 2. ƒ. 3.
Parmelia tenax. Ach. JVIeth. 2 3 1 .
S E N T from North Wales by the Rev. Hugh Davies. It
grows in alpine moist situations, amongst mosses, to which
its tenacious, fleshy and juicy fronds closely adhere. The
form of the whole is more or less regularly orbicular, the segments
spreading in a radiating position, subdivided in a dichotomous
palmate manner, being not very densely imbricated.
They are flat, and their ultimate lobes blunt. The green inclines
to glaucous, and by drying becomes opaque and lead-
coloured. Shields numerous, scattered, depressed, of a light
red brown; when young slightly sunk in the leaf, and a little
concave; afterwards more prominent, rather convex and uneven,
dilated, with a narrow border of the substance of the
leaf, whieh sometimes becomes tumid and notched.