2704. (Pig. 1.)
COLLEMA limosum.
Mud Collema.
CRYPTOGAMIA Lichenes.
Gen. Char. Apotheda scutelliform, (immersed, sessile,
or somewhat stalked,) formed entirely from
the thallus, and of a homogeneous substance
without and within, subcartilaginous when dry,
subgelatinous when w e t; margin and disk of the
same, or sometimes (when dry) of different colours.—
Acharius.
Spec. Char. Lobes of the thallus scattered, appressed,
thick and pulpy, flattish, slightly crenulate; almost
evanescent in drying. Scutellae immersed ;
margin at length somewhat prominent, nearly
entire.
Syn. Collema limosum. Ach. Lack. Univ. 629. Syn.
309.
Parmelia limosa. Ach. Meth. 232.
Lichen limosus. Ach. Lich. Prod. 126. excl. syn.
Hoffm. Ach.in Act. Stockh. for 1801.158. t. 3 .f. 1.
P E R H A P S common on wet clayey soil, although it has
been but little noticed, and has hitherto remained unpublished
as a British Lichen. Our specimens came from
Hurstpierpoint, Sussex, and have been compared with an
authentic one from Acharius. Indeed his excellent description
in the Stockholm Transactions sufficiently ascertains
the species.
Thallus composed of small gelatinous pulpy lobes, appressed
to the soil, at first mere granules, at length irregu