176 ULVAC EÆ. [ Ulva- Bangia.] U LV A C EÆ. 17 7
f : .
I :
ii
6. U l v a f u h f u k a c e a . Tafi. XVIII.
Fiomls very minute roumlish-ovate distinct subereet, forming a tliin
crowded stratum.
Vlva furfu ra cea , F l. D a n . t. 14(li). I.y n g b . H y d ro p h . D a n . p . 3-2. Ag . S p . Alg. v . 1.
p . 417. S y s t. A lg . p . IIKI. G r e v . C r y p t . F l . p . 265. S p r e n g . S p . P l. v . 4. p . .m
H a b . On stoile-walls, and even planks of wood, in damp shady
places. Appin, Capt. Carmichael. On the walls of King’s College,
Cambridge, Rev. M J. Berkeley.
Plant producing a furfuraceous stratum. Fronds scarcely a line
long, crowded, somewliat erect, of a roundisli-obovate form, attached
by a minute attenuated base : margin entire or somewhat lobed, and frequently
more or less inflexed. Fructification, minute quaternate granules,
generally so aixanged as to form square masses with vacant intervals.
Substance thin and tender. Colour a full dark green.
A very interesting discovery and addition to the British Flora;
made in Scotland by the late Captain Carmichael, and in Fngland by
my acute friend Mr Berkeley. It is the smallest known species,
7. U l v a c a l o p h y l l a .
Fronds minute linear twisted entangled, forming a dense thin (lark-
green stratum.
Ulm calophylla, S p r e n g . S p . A lg . v . 4. p . 368. G r e v . C r y p t . F I . (.S ynopsis) p. 42.
Bartgia calophylla, C a rm ic h . in G r e v . C v y p t. F I. t . 220.
H a b . On a block of stone near the Clergyman’s house in the Island
of Lismore. October. Capt. Carmichael.
plant tufted, forming a thin velvety stratum. Fronds two or three
lines in length, plane, linear, some quite narrow, others broad, straight
or curiously curved and twisted, the apex rounded, the base attenuated.
Fructification, quaternate granules arranged in lines, a single line being
found in the narrowest fronds, while in the broadest there are as many
as ten or twelve. Substance thin and transparent. Colour a fine dark
green.
The most singular and beautiful of the minute Ulvæ, and very
nearly related to Viva velutina [Scytosiphon velutinus, Lyngb.) wliich,
however, is an aquatic species. ' Ulva calophylla, in the only station
observed by its discoverer, covered a large stone with a dark-green
velvet-likæ stratum ; and, if diligently searched for, will probably be
found to exist in many other places.
G e n u s X L IX . BANGIA, Lyngh.
G e n . C h a r . Frond flat, capillary, membranaceous, of a green,
reddish, or purple colour. Fructification, granules a rranged
more or less in a transverse manner.
O bs. Having had occasion to examine some remarkably fine specimens
of Bangia fusco-purpurea, since I commenced the description of
the U lv a c eæ for this work, I have been led to study the Bangioe attentively,
in regard to their affinities. The result induces me to remove
them from the C o n fer v o id eæ , where they are arranged by
Agardh, and to place them in the present Order. Their plane fronds
possess a structure very similar to that of the Ulvæ, to which they
approach very closely, Ulva calophylla and velutina being in fact exceedingly
similar in habit and size to some Bangioe. Like them, the
Bangix are apt to vary in the width of the fronds, and often even in the
same frond. When a frond is so narrow as to contain only one series
of cellules, it has then much the appearance of a Conferva, the cellules
having the aspect of joints ; the granules, under similar circumstances,
are sometimes so uniform as to look like annular bodies within
a tube, and then it resembles an Oscillatoria, or a Scytonema. The
species truly belonging to this genus appear to be Bangia crispa and
B. fusco-purpurea of Lyngbye, and B- torta of Agardh. Bangia
Laminariæ is doubtful.
It is a source of regret to me, that, in consequence of the plates
being completed and in the hands of the colourer, I cannot in the present
edition give a figure illustrative of the genus. The name it bears
was appropriated to it by Lyngbye, in honour of his friend Hofmann
Bang, who has made several discoveries in this department of botanical
1. B a n g ia f u s c o -p u r p u r e a .
Fronds capillary, dark purple or brownish purple, often waved and
crisped at the extremity, granules densely arranged.
Bangia fusco-purpurea, L y n g b . H y d r o p h . D a n . p . 83. t . 24. G r e v . F I . E d in . p . 302.
S p r e n g . S p . P I . v . 4. p . 361.
Bangia atro-purpurea, A g . S y s t. A lg . p . 76.
Conferva fusco-purpurea, D illw . B r i t . C o n f . t - 92. S m . E n g . B o t. t . 2055.
Conferva atro-purpurea, R o th . C a t . B o t. v . 3. p . 208. t. 6. D illw . B r i t . C o n f e rv . t . 103.
Sm . E n g . B o t. t. 2085.
M
4k
■ -t*. 1
' v r r r