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C O L L EM A plicatile.
P la ite d Collema.
CRYPTOGAMIA Algae.
G en. Char. Shields orbicular, horizontal, nearly
sessile, superficial, with a gelatinous accessory
border.
Spec. Char. F ro n d somewhat fleshy, im b ric ated ;
lobes plaited, rounded. Shields reddish brown,
concave, crowded.
S i s . Lichen plicatilis. Ach. Prodr. 129. Act. Nov.
Holm.v. 16. 11. t. 1 . ƒ . 2 . Bernh. in Schrad.
Journ.for 1799. fuse. 1. 13.
Parmelia plicatilis. Ach. Meth. 240.
F o r this we are indebted to Mr. Griffith, who sent it from
North Wales; and we have also fine specimens named by
Dr. Acharius.
Wet or inundated rocks, in alpine situations, produce the
present species, whose dark-green frond is of an imbricated,
clustered, plaited, orbicular form, with numerous small lobes;
its texture between membranous and fleshy; the surface smooth.
Shields very plentiful, more or less crowded or clustered, sessile,
sometimes elevated, the size of common pins’ heads.
Their shape is cup-like, or almost globose, with a concave
reddish-brown disk, and thick, smooth, inflexed border, of
the substance of the leaf. This border often remains long after
the disk and its contents are gone, the inside assuming a pale
or whitish aspect.