P l a t e XXIII.
NITOPHYLLUM BONNEMAISONI, Grev.
Gen. Chae. Fraud membranacemis, reticulated, rose-red, (rarely purplish),
irregularly cleft, veinless, or furnished with irregular veins toward the
base. Fmctifical'ion, two-fold, on distinct plants ; 1, spherical tubercles
(coccidia) immersed in the frond, and containing a globular mass
of angular spores; 2, tetraspores grouped into definite sori or spots,
variously scattered over the frond. N i t o p h y l l u m —corruptly formed
from nitor, to shine, and cjaiXXoi/, a le a f; shining-leaf.
N it o p h y l l u m Bonnemaisoni; frond shortly stalked, fan-shaped or palmate,
variously cleft into numerous wedge-shaped segments, furnished near
the base with irregular, vanishing nerves; spots of granules roundish,
scattered over the surface of the frond.
N it o ph y l lu m Bonnemaisoni, Grev. Alg. Brit. p. 81. Hoolc. Br. M. vol. ii.
p. 287. Harv. in Mack. FI. Hib. part 3. p. 193. Harv. Man. p. 58.
D e l e s s e r ia Bonnemaisoni, Ag. Sp. Alg. vol.i. p . 1 8 6 . Ag. 8yst.'^.2'¡>2.
Grev. Sc. Crypt. FI. t. 8 2 2 .
A g la io ph y l l um Bonnemaisoni, Endl. 3rd. Suppl. p . 62.
H ab. Growing on the stems of Laminaria digitata; and on rocks and
stones in 4—5 fathom water. Annual. Summer. Orkney, Bev.
C. Clouston. Bute, Br. Greville. Larne, Br. Brummond. Youghal,
Miss Ball. Torquay and Hfraoombe, Mrs. Griffiths. Tramore,
M m Taylor. Miltown Malbay and Kilkee, W.E.H. Strangford
Lough, W. Thompson, Esq. Jersey, Miss White.
G e o g r . D is t . Coast of Normandy, Bonnemaison. British Islands.
D e s c . Root a small disc. Stem a quarter of an inch long, cylindrical, expanding
into a fan-shaped, delicately memhranaceous frond, 2-4 inches in length,
and rather broader than its length, rarely quite veinless; usually marked
toward the base with more or less evident, vanishing nerves, which sometimes
extend considerably up the segments, and sometimes are nearly confined
to the very base. The habit of the frond varies much in different in-
dividnals, in some the lamina is very broad and not deeply cloven; in others
cleft nearly to the base in long ribbon-like segments. The division is pretty
regularly dichotomous, hut the margin in some specimens is proUferqus,
giving the frond a very compound aspect. Colour a fine rosy red, becoming
brownish, especially toward the base, in drying. Bntieulations (fig. 3, 5.)
smaller than in N. versicolor. Tubercles small, not very prominent, scattered
over the frond. Spots of tetraspores oblong or roundish, minute, but larger
than those of N. Hillice, very abundantly scattered over the surface. I t
more or less perfectly adheres to paper in di-ying.
The fan-like outline, scattered groups of tetraspores, and obscure
G