94 MARINE ALG 
ORDER CRYPTONEMIACEA 
SUBORDER GLOIOSIPHONIEE 
Genus Gloiosiphonia 
(‘ Viseid tube") 
G. capillaris. Frond six to ten inches high, solitary or in tufts; 
main stem cylindrical, solid above, hollow below; from about an inch 
above the base densely beset with short, wide-spreading branches 
arranged evenly and all around the stem; branches again branched in 
the same way; branches and branchlets attenuated at base and apex; 
‘soft, tender, juicy; shrinks muchin drying. Thespeciesis easily recog- 
nized by its delicate gelatinous substance, tapering branchlets, and 
brilliant red color. It is found in early summer in tide-pools on the 
New England coast. 
SUBORDER GRATELOUPIEE 
Genus Halymenia 
HI. ligutata. Frond membranaceous, repeatedly and regularly 
divided in a forking manner; the larger divisions one half of an inch 
wide and growing very narrow at the top; four to five inches high, 
spreading in a fan-shape; color rose-red. It is found at Key West. 
Genus Grateloupia 
G. Cutleria. Frond coarse, flat, variable; either simple, long, and 
narrow, or short and broad, tapering at both ends, or blunt at the apex, 
or deeply cleft into many segments; sometimes with leaflets along the 
edges; height two to three feet; color reddish-brown; in fading, 
changes to purple and green, and may be variegated. When simple, 
the plant resembles Jridea. Found on the northern California coast. 
Genus Prionitis 
P. lanceolata. Frond narrow, fiat, smooth; leathery stems, which 
branch irregularly and sparingly from the edges; branches bordered 
with lance-shaped leaflets; color dark brownish-red ; plant ten or more 
inches high, and varies considerably. (Plate XXXV.) 
There are other species, among them P. Andersonii (Plate XXXVI); 
all are easily distinguished by the lance-shaped leaflets. Common on 
the Pacific coast. 
SUBORDER DUMONTIER 
Genus Pikea 
P. Californica. Divisions of frond thick, narrow, cartilaginous; 
central axis one eighth of an inch to one inch wide, three to four inches 
high, thickly set with similar branches irregularly placed; all bordered 
