Ser. RHopOSPERME®. Fam. Delesseriez. 
Puate CCXXXV. 
NITOPHYLLUM GMELINI, Grev. 
Gen. Cuar. Frond membranaceous, reticulated, rose-red (rarely purplish), 
irregularly cleft, veinless, or furnished with irregular veins towards 
the base. ructification two-fold, on distinct plants; 1, convex 
tubercles (coccidia) immersed in the frond, and containing a mass of 
spores; 2, ¢etraspores, grouped into definite sor? or spots, variously 
scattered over the frond. Nrropuyittum (Grev.),—corruptly formed 
from nitor, to shine, and pvddov, a leaf: 
Nivopxyttum Gmelini; frond short-stalked, fan-shaped, with a roundish 
outline, variously cleft into broadly wedge-shaped segments, waved, 
curled, rather rigid, marked near the base (and sometimes over the 
surface) with vague, vanishing nerves; spots of tetraspores linear, 
confined to the margin. 
NiToPHYLLUM Gmelini, Grev. Aly. Brit. p. 82. Hook. Fl. Brit. vol. ii. p. 288. 
HE. Bot. Suppl. t. 2779. Wyatt, Alg. Danm.no.65. Harv. in Mack. Fl. 
Hib. part 3. p.193. Harv. Man. p. 58. 
AGLAIOPHYLLUM Gmelini, Mont. Endl. 3rd Suppl. p.°52. Kiitz. Phyc. Gen. 
p. 443. Endl. 3rd Suppl. p. 52. 
DevessERia Gmelini, Lamour. Ess. p. 36. 
Has. On rocks, and the larger Algae, near low-water mark, and at a 
greater depth. Annual. Summer. South of England ; particularly 
large and abundant near Plymouth. North and west. of Ireland. 
Howth, Miss Gower. Jersey, Miss White and Miss Turner. 
Grocer. Distr. Atlantic coasts of France and Spain. 
Dezscr. Root a small, conical disc. Stem from a quarter to half an inch in length, 
cylindrical and cartilaginous below, soon becoming compressed, and then 
expanding into the wedge-shaped base of the frond. Frond two to six 
inches in length, and as much or more in breadth, flabelliform, with a 
roundish outline, either nearly entire, with the margin cut into shallow 
lobes, or deeply cleft into numerous broad segments, which are either 
jagged or subdivided in a dichotomous manner; and sometimes cut into 
narrow ribbons. Segments cuneate at base, widening upwards, their apices 
rounded, or angularly cut. The margin is generally much undulated. From 
the base of the frond there issue numerous branching veins, which ramify 
over the surface, and gradually become fainter upwards; these in some 
specimens are faint, and soon lost, and in others are strongly marked and 
evident, even in the upper segments. Tuderc/es either confined to the mar- 
gin, or scattered over the disc of the upper lobes, hemispherical, depressed, 
containing a large tuft of dark-red spores. Tetraspores disposed in linear 
sori, always placed just within the margin of the frond, and following its 
curvature. Colowr a full deep-lake, becoming a bright pink in drying. 
Substance crisp, and somewhat rigid, crackling in the fingers ; becoming 
flaccid in fresh-water. Ced/s of the surface large, irregularly hexagonal. 
enw 
VOL. Ir. 2F 
