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GYMNOGONGRUS 107 
and has more pointed apices. In general habit it resembles 
the New Zealand plant more than the Peruvian, but its segments 
are only about half as broad as those of the former. 
PLATE 40, FIGURES 12-17. Gigartina tuberculosa 
12. Apical portion of a thallus segment bearing young eM 
13. A single mature cyatocarp in surface view of {һе segmen 
I he same cystocarp in profile in edgewise view де the пари segment. 
zs. ех of a cross section of а hake segment near base of the plant 
16, 17. Outlines of cross sections of terminal segments. 
of the figures are drawn from Coker 565 p.p. (Mollendo) and all are enlarged 
62 diameters. 
PLATE 41. Gigartina tuberculosa 
A. Photograph of a cluster of vey 4. cystocarpic plants (from Наша 
preservative—Coker 565 p.p.), natural s 
B. Photograph of a portion of Нана same specimen, showing mode of branching, 
etc., natural size. 
Gigartina lemanaeformis Bory, Voy. Coquille, Bot. Crypt. 151. 
1828, described from specimens collected at Paita by d'Urville in 
1823, is, we believe, a Cordylecladia and will be referred to more 
fully under that generic name. 
Gigartina Gaudichaudii Mont., described from a specimen col- 
lected at Paita by Gaudichaud, is apparently Agardhiella tenera, 
q. v : 
GYMNOGONGRUS Mart. FI. Bras. 1: 27. 1833 
GYMNOGONGRUS FURCELLATUS (Ag.) J. Ag. Sp. Alg. 2: 318. 
5 
Sphaerococcus furcellatus Ag. Sp. Alg. 1: 253. 1822. 
?Chondrus sejunctus Bory, Voy. Coquille, Bot. Crypt. 160. 1828. 
Chondrus furcellatus Grev. Alg. Brit. lv. 1830. Kütz. Tab. Phyc. 
17: 16. М. 55. jJ. c]. 1867. 
Chondrus violaceus Sond.; К г. Sp. Alg. 735. 1849; Tab. Рус, 
19:15. ph. 57. 1867. 
Chondrus concinnus Kütz. Tab. Phyc. 17: pl. 57. f. c,d. 1867. 
Chondrus bidens Клиз. Tab. Phyc. 17: 17. pl. 59. f. c, 4. 1867. 
САҒЫ coarctatus каш Tab. Phyc. 17: 18. pl. бо. f. d, e. 1867. 
vermicularis forma americana J. Ag. Sp. Alg. s: 213. 
1876. 
On rocks, water-front of Callao, ' *purplish," Dec. 27, 1906, 
Coker 17 p.p. (PLATE 42; sterile, approaching the Chondrus 
violaceus of Kützing's Tab. Phyc. 17: 21. 51. f. à); in beach drift, 
