166 GRATELOUPIACEAE 
that the attempt to draw satisfactory specific lines is attended with 
great difficulties. In venturing to arrange the Peruvian forms of 
Grateloupia in the following manner, we do it with no particular 
confidence in the finality of the arrangement. 
Grateloupia Cutleriae procera forma nova 
Thallus linear, 85-175 cm. long, 4-16 cm. wide, 0.19-0.33 mm 
thick, simple, the margins entire, crenulate-denticulate, crenulate- 
verrucose, or, very rarely, with an occasional short proliferation, 
or thallus broader (max. width about 25 cm., max. length about 
I m.), obovate or obcuneate-oblong and cleft to about the middle 
into 2-5 linear lobes, these sometimes again lobed at apices, che 
margins otherwise subentire; surface smooth. [PLATES 59 and 
60. 
On the water-front of Callao, December 27, 1906, Coker 17 
Р.р., “ purplish”; also, in beach drift, La Punta, region of Callao, 
January 25, 1907, Coker 37 (PLATES 59 and 60), “ригрИз За 
specimens mostly tetrasporic. 
The thallus of this striking plant is often pertuse with аве. 
We had supposed the plant to be Kiitzing’s Halymenia lapathi- 
folia,* described and figured from the same locality, until we had 
the privilege of examining Kützing's original of this species and 
found it to be a plant of a different structure. 
In the Kützing herbarium, now in the possession of Mme. A. 
Weber-van Bosse, Grateloupia Сийетае is represented by three 
specimens of the probably original material, which was from 
Valparaiso. Тһе smallest of the three plants is 18-20 cm. long; 
2 cm. in greatest width, and about 0.23 mm. thick, with neatly 
entire margins, and is tetrasporic. The second is is also te tetrasporic, 
* For description, see Sebdenia, p. 162. 
1 GRATELOUPIA PER pom ДЕ Сеп. 398. pl. 77. f. ІІ. 1843; Tab. 
Phyc. 17: pl. 37. 1867. tleriae t. Voy. Bonite, Bot. Crypt. 63. 1846; 
Kütz. Sp. Alg. 726. 1849. In citing vei name it has been customary to іп 
“Bind.” in parenthesis, presumably because Kützing in the place of original publica 
tion cited “ Halymenia Cutleriae Herb. Bind.," without stating who wa и responsie 
Hering." Montagne (loc. cit.), without aym seen Kützing's description, ascribes 
the herbarium name to “Mart. et Her erg." In Kützing's — vel appar parently 
original label reads “ Halymenia Cutleriae v. Mart. Valparaiso." Und der 
NUN n nM ы И о Bind. 
+hetical " 
currently used in citing Kützing's name for this present species. 
