PACHYMENIA 171 
base, which is about 2 cm. long, dissolves subpalmately-dicho- 
tomously into three segments, one of which soon divides again, 
so that there are four main linear-lanceolate lobes, which are 
8-16 mm. broad and 8-12 cm. long; two of the main segments 
are again subdichotomous near the apex; near the base and 
apex аге a few lanceolate, simple or furcate marginal lobes or 
proliferations r—2.5 cm. long; except at extreme base, the mar- 
gins are beset with small aculeate teeth and Ше surfaces are 
scabrous with minute aculeae, verrucae, and papillae. In a 
section the medulla is filamentous, rather compact, and 0.3- 
0.5 mm. broad; the cortex proper consists of nearly parallel 
anticlinal filaments 6-10 cells long, these cells mostly oval- 
ellipsoid and twice as high as broad; the subcortex consists 
of several series of cells whose protoplasts аге mostly 11—16 ш 
in maximum diameter; the peripheral or surface cells are oval 
or clavate, their protoplasts 3-8 и high and 1.5-3 times as 
high as broad; surface jelly 4-8 u thick. Тһе cystocarps аге 
minute (115-300 и in diam.), deeply immersed, and have а 
small basal placenta. No form of fructification was observed 
by Montagne. J. Agardh (Sp. Alg. 2: 242), knowing the plant 
only from Montagne's figure and description, referred it, with 
a question mark, to Rissoella and he has been followed in this 
by De-Toni, but the cystocarps are very different from those of 
Rissoella and its allies. It seems to us that the species 1s 
most at home in Grateloupia, where originally placed, though 
possibly a thorough examination of the development of the 
cystocarp might indicate other affinities. From the typical 
Sebdenias the species differs in the thicker thallus and the 
softer more distinctly filamentous cortex. 
Grateloupia filiformis Kütz. was originally described (Sp. Alg. 731. 
1849) as coming from Peru, but was afterwards figured (Tab. 
Phyc. 17: 8. pl. 25. f. d. е. 1867) from a specimen attributed 
to St. Thomas, West Indies. It is considered by J. Agardh 
and by De-Toni to be a synonym of Grateloupia filicina (Wulf.) 
A 
PACHYMENIA J. Ag. Sp. Alg. 3': 143. 1876 
Pachymenia cuticulosa sp. nov. 
Thalli greenish (?), gregarious, from short-cuneate bases or 
