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PALMELLA cruenta.
Purple Palmella.
C lass and Order CRYPTOGAMIA ALGá:, Lkm—N a t . Ord. ALGAS, Juss. Ag.
g e n e r ic c h a r a c t er .
" Gelatina hy alina, expansa vel globosa, granulis discretis ghbulosis vel ellipticis
farcta.”—^Ag a r d h .
A hyaline gelatinous receptacle, spreading, globose, filled with distinct globular
or elliptical granules.
S PE C IF IC c h a r a c t e r .
P almella c r u e n t a ; fronde crustceformi tenuissima, cruenta.
P. frond crust-like, very thin, dark blood-colour.
P almella c r u e n t a , Ag. Syst. Alg. p . 15.
T r em e lla cruenta. Smith, Engl. Bot. t. 1800.—Belli. FL Cant. ed. 3. p. 509.
—Purt. Midi. FI. v.2. p. 6l6.—Hook. FL Scot. 2. p. 32—'Grev. FI. Fdin.
p. 427.
T h e l e p h o r a ? sanguinea, Pers. Syn. p . 575.
P h v to c o n is purpurea, Bory, 1 _
B ys sus purpurea, Lamarck, J
H ab. On damp walls in shaded places, chiefly near th e ground. Autumn
to Spring. Plentiful around Edinburgh.
Plant spreading for many inches in the form of a very thin gelatinous crust
on the surface of damp walls, especially when slightly covered with soil.
Its colour is a fine rich dark purple. Under the microscope, the structure
is very obvious ; the gelatinous frond swells into globose portions,
unequal in size, filled with a multitude of roundish or oval granules.
I trust no apology will be necessary for giving tbis Alga
a place in tbe present work, as tbe representation in “ English
Botany” is simply that of its general appearance. Besides,
along with, I hope, a careful analysis, I am now enabled to publish
it as a true Pahnella, in which genus it has been placed
by A g a r d h , with nine other species. Among these, are found
four species, natives of Britain; the Ulva protuberans of Engl,