LICHEN pulveruîentus.
Green Powdery Stellated Lichen.
CRYPTOGAMIA Algae.
Gen. Char. Male, scattered warts.
Female, smooth shields or tubercles, in which the
seeds are imbedded.
Spec. Char. Imbricated, flexible, stellated, deep glaucous
green; hoary-ashcoloured when dry ; its segments
dilated, flat, obtuse, .wrinkled; black and
downy beneath. Shields glaucous-black, with a thick,
inflexed, at length leafy, border.
Syn. Lichen pulverulentus. Schreb. Lips. 128. Ach.
Prod. 112. Relh. 4 6 1 . Sibth. 325. Hagen 66
2 . / . 8.
L. stellaris (2 & y. Huds. 534. With. v. 4. 3 1 .
Hull. 2 9 4 . Light/. 824 (2.
L. allochrous. Ehrh. Crypt. 187.
Lichenoides glaucum orbiculare, segmentis latiusculis,
scutellis nigris. Dill. Muse. 177. t. 24. f . 71.
L. arboreum et saxatile, crusta foliosa tenui, fusco-
virenti, in segmenta latiora plerumque divisa. Dill,
in Raii Syn. 74 j also L. arboreum, crusta foliosa
informi, scutellis subnigris, limbo cinereo crispo
cinctis. Dill, in R. Syn. 75.
Parmelia pulverulenta. Ach. Meth. 210.
V e r y common on the trunks of Ashes, Oaks, Beeches,
&c., at all seasons, but growing most in the moist winter
months.
Nothing can be more distinct than this species from the
L. stellaris, t. 1697, with which Linnaeus and his followers
confounded it, though unhappily our figure of that,, by a
gross error of the colourer, is made green, whereas the plant
is of a silver grey, unaltered by moisture, which in Mr.
Sowerby’s original drawing was faithfully expressed. The
present species, on the contrary, is of a fine, deep, rather
glaucous, green when wet; of a dull, brownish, grey when
dry. The fronds are also larger, composed of broader, more
dilated and rugged segments. The shields are larger and
more clumsy, first grey, then black, with a thick border
of the substance of the leaf, which as it advances in age acquires
a scaly, and often leafy, circumference.
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