98 PROCEEDINGS OF THE AMERICAN ACADEMY. 
growth of cortical cells. It is to be regretted that more is not known as 
to the mode of growth of the frond. As it is, this alga, although at first 
sight it suggested Peyssonnelia rugosa Harv. in its habit, cannot be re- 
ferred to that genus, for the frond in section is seen to be symmetrical 
except that the cortical cells on the under side are more uniformly in a 
single layer than above, but quite different from the well-defined base of 
Peyssonnelia. Nor can it be considered a prostrate form of Kallymenia 
or Constantinea, to which it appears to be more nearly related. It might 
be suggested that the specimens were abnormal developments of some 
species with erect fronds, but the abundance of aporiats appear to indi- 
cate that the growth was normal. 
Hypnea, Lamx. 
H. pannosa, J. Ag. Oefy. Kongl. Vet. Akad. Forh. iv. 14 (1847). 
— ALBEMARLE Is.L.: Tagus Cove, Feb. 1889, Snodgrass & Heller. 
Further distrib. tropical seas. 
Lavrenoia, Lamx. 
L. oprusa (Huds.) Lamx., var. Graciis, Harv. Ceyl. Alg. 26; 
Piccone (1), 80.— Cuaruam Ist.: March, 1884, Marcacci, acc. to 
Piccone, l.c. Further distrib. general. 
Lirnoryyiium, Phil. 
*L. Fartown, Heydrich in Engler, Bot. Jahrb. xxviii. 532, t. 1, f. 6 
(1901). — Cuarces Ist.: Hassler Hxped. Endemic. 
LirHotHamnNivum, Phil. 
L. crassum, Phil. Weigm. Arch. 1837, 2, p. 888; Piccone (2), 45. 
— Cuarves Isu.: Marcacci, ace. to Piccone, |. c. 
No specimens ofthis species have been seen, and I am unable to say 
whether the alga collected by Marcacci on the Pisani Exp. is the same as 
the L. crasswm, originally described from the Mediterranean, as that 
species is now understood. 
Mevopsesia, Lamx. 
M. corticirormis, Kiitz. Spec. Alg. 696 (1849).— Wenman Ist. : 
on Gelidium serrulatum, Dec. 1888, Snodgrass & Heller. Further 
distrib. general. 
M. pustutata, Lamx. Hist. Polyp. Flex. 315, t. 12, f. 2 (1816) 5 
Piccone (1), 65.— Cuaruam Isu.: (on Zonaria lobata) Marcacci, 
ace. to Piccone, 1. c. Further distrib. general. 
2 Lee 
* Name changed to L, ———. os eecealoame Ber. deutsch. bot. Ges. xix, 430, 
| as itis antedated by L, Pardo, 
