size, sessile on the disk of the lobes, concave with a thickish
margin when young, but soon flat or even convex, the margin
becoming depressed, narrow, crenulate or granulate,
and at length fringed with numerous small leafy processes
like those upon the thallus : disk, whether wet or dry, sometimes
of the same colour as the thallus, sometimes, perhaps
from age, tawny or brick-red, which hue it usually
assumes unalterably in drying.
This Lichen only is preserved in the Dillenian Herbarium
as the plant represented by the figure in the Historia Mus-
corum quoted above; it must therefore be regarded as the
Lichen crispus of Hudson and Linnams, and ought to retain
the name. I t is possible that C. crispum («.) of Acha-
rius, (Syn. Lick. p. 311.) may belong to this species ; but
it is more probable that it stood better, with all the varieties,
where he had placed it in his Lichenographia Universalis,
under C. pulposum (Lichen pulposus of Bernhardi),
which is the Lichen crispus of Engl. Bot. t. 834. The
latter is excellently described by Wulfen (in Jacquin’s Collectanea,
v. 3. p • 139. t. 12. ƒ 1.) as the L . cristatus of
Linnasus, a species adopted, as L . crispus was, from Hudson
and Dillenius. In this instance the Dillenian Herbarium
fails us ; for under the No. (t. 19. f . 26.) to which Hudson
refers as his L. cristatus, are preserved one specimen
of the larger variety of C. pulposum Ach. (usually regarded,
we believe, as L . cristatus), others of the plant now before
us, and one or two of our C. ceranoides. The figures
and descriptions in the Historia Muscorum do not decide
the question. We have not examined the specimens in
the Herbaria of Sherard and Buddie. In the present
state of our information we would call the species crista-
tum rather thans pulposum; since it cannot be doubted
that that larger variety at least, which grows on the
ground, and has more erect and more laciniated lobes,
was contemplated by Hudson, and the places of growth he
gives, “ in rupibus, saxis et muris passim,” lead to the
presumption that he included the smaller and more common
form also. From all the states of that very variable
Lichen, our C. crispum is readily and satisfactorily distinguished
by its thinner and more leaf-like lobes. L . granu-
latus of Hudson (and Engl. Bot. t. 1757, C.furvum of Acha-
rius,) is distinguished from C. crispum by the larger lobes,
more pulpy when wet, and sprinkled on both surfaces with
granules which do not become leafy, and by the smaller,
almost stalked scutellae, with an entire, elevated margin.
This also we would call by Hudson’s trivial name, although
it is at least doubtful whether it is the same as the Dillenian
plant from the walks in the Oxford Garden, Hist. Muse,
t. 19. f . 24.—W . B.
2716. (Fig-. 2.)
COL LEM A dennatinum.
Skinny Collema.
CR YPTOGAMIA Lichenes.
Gen. Char. Apothecia scutelliform, (immersed, sessile,
or somewhat stalked,) formed entirely of the
thallus, and of a homog-eneous substance without
and within, subcartilaginous when dry, subge-
latinous when wet; margin and disk of the
same, or sometimes (when dry) of different,
colou r s.-—Acharius.
Spec. Char. Lobes of the thallus between gelatinous
and coriaceous, rounded, with ascending sinuated
edges; upper surface sprinkled with granules.
Scutellm somewhat stalked 1 margin narrow, entire,
slightly raised.
Syn. Collema dermatinum. Ach. Lich. Univ. 648.
Syn. 322.
Lichenoides gelatinosum, lobis crassioribus fusco-
viridibus. Dill. 138. t. 19.f.2 2 .
F o u n d on calcareous rocks; with scutell®, in North
Wales, by Mr. Griffith; without them, in Leigh Wood,
near Bristol, by Mr. Forster.
Thallus roundish, adhering without roots, composed of
rounded, irregularly sinuated lobes, of a tenacious gelatinous
substance between membranous and coriaceous, and
of a dark olive or bronze-green^on both sides ; when dry,
very rigid, browner above, and on the underside of a bluer or
more bronzed hue and marked with long narrow wrinkles,
like shrivelled skin. Outer segments expanded, flattish,
or rather convex, but raised at the edges, producing in a
proliferous manner from their disk those that form the
central part of the patch, which are nearly erect, concave,
clustered. Edges sometimes entire, sometimes crenulate
or almost fringed, slightly incrassated when dry. Surface
not wrinkled, but sprinkled with small granules, globular,
and of the same colour as the rest of the thallus when wet,