100 GIGARTINACEAE 
by Chamisso on the shores of Chile. Dr. Coker's Peruvian 
material does not include anything that precisely matches the 
Chilean type, though his 123 p.p., from the Bay of Pacasmayo, 
"brought up on a fish hook from six fathoms," makes а close 
approach to it. However, Gigartina Chauvinii and G. Lessonn, 
though both also typically from Chile or farther south, occur in 
Coker’s Peruvian collections in essentially typical forms and both 
appear to be connected with the earlier-described С. Chamissot 
by a full series of intermediates. Gigartina Lessonii and G. 
Chauvinii differ principally in the width of their main axes. 
They are different enough in their extreme forms, as may be seen 
by comparing our photographs (PLATES 37 and 38) and we find a 
certain convenience in falling in with the current custom of refer- 
ring to them as “species,” even though confessing that we do not 
know how to draw lines separating the two from each other or either 
from С. Chamissoi. Gigartina Chamissoi has been reported from 
Callao and Рана by Montagne (loc. cit.) and from Pisco by 
Pilger (Hedwigia 48: 180. 1908). ` 
GIGARTINA І.вөзохп (Bory) J. Ag. Sp. Alg. 2: 268. 1851; 
3': 192. 1876 
Sphaerococcus Lessonii Bory, Voy. Coquille, Bot. Crypt. 169. 
1828. 
“Оп rocks near N. Е. end of water front of Callao, purplish, 
Dec. 27, 1906, Coker 17 p.p.; in beach drift, La Punta, region of. 
Callao, “green in color," Dec. 1906, Coker 23 p.p.; on tide rocks, 
Bay of Ferrol, region of Chimbote, Mar. т, 1907, Coker 119 PP: 
Lobos de Tierra, Apr. 2, 1907, Coker 151 p.p.; оп surf-washed 
rocks, "dark olive-green," Chincha Islands, June 18, 1907, Coker 4 
195a (PLATE 37); “іп one fathom, olive-green,” Isla Vieja, Bahía 
de la Independencia, July 20, 1907, Coker 09640 p.p.; from drift 
on the beach, Pisco, July 7; 1908, Coker 465 p.p. E 
Тһе best-developed of these specimens, though possibly not the. 
most typical in the historic sense, are Coker's 195a (PLATE 37). 
The plants under this number reach a length of 20 cm., they аге 
often 1-4 times dichotomous, the main axes are nearly terete below 
but are for the most part distinctly complanate and about 2 m T- 
broad (often only 0.5-1.0 mm. after drying); the tetrasporic 
