146 RHODOMELACEAE 
strict and fastigiate and there аге 6-10 pericentral siphons, while 
in B. rivularis, so far as we have observed, there are 6-0 реп- 
central siphons. We have not observed any other noteworthy 
differences, though we have not examined cystocarps in the 
original В. Гертеити. The thallus of B. Leprieurit has the 
external appearance of being regularly segmented, with the ends 
of the pericentral siphons of each segment nearly even, as well 
represented by Kiitzing, who evidently drew his figures from 
authentic material, and Harvey’s figures of B. rivularis show the 
same character, which is exhibited also by Dr. Coker’s specimens. 
Kiitzing’s figure of B. rivularis, however, shows more irregularly | 
disposed and relatively shorter pericentral siphons and he accord- 
ingly endows it with "articulis obsoletis." Such specimens from | 
the southern United States we have seen, currently referred to 
B. rivularis. Тһе original B. Leprieurii shows monosiphonous 
apices 2-6 cells long; Harvey represents B. rivularis as having 
unbranched monosiphonous apices 8-14 cells long; Kützing 
reduces the monosiphonous apex of В. rivularis to one cell; in Dr. 
Coker's Peruvian material many of the branches show mono- 
siphonous apices 4-12 cells long; these cells are not so elongate as 
in B. Moritziana (Sond.) J. Ag. and such apices are not branched. 
Hapteres are of occasional occurrence in the Peruvian specimens 
but are not such a regular and striking feature as in the original | 
B. radicans, which has the appearance of being specifically distinct. 
De-Toni (Syll. Alg. 4: 1150. 1903) places Bostrychia Lepri- 
eurii in Falkenberg's section Stictosiphonia, possibly because J. 
Agardh once placed it in а differently characterized section 
Stictosiphonia, but the plant belongs іп the section Н elicothamnion | 
as defined Бу Е alkenberg and by De-Toni. It certainly should 80 
into whatever section receives B. rivularis and we do not know by 
just what characters B. rivularis may be distinguished from it. 
STREBLOCLADIA Schmitz, in Engler & Prantl, Nat. 
Pflanzenfam. 1?: 457. 1897 
STREBLOCLADIA CAMPTOCLADA (Mont.) Falkenb. 
Rhodomelaceen 345. pl. 20. f. 9, 10. 
ЗЕН pisi | 
Polysiphonia camptoclada Mont. Ann. Sci. Nat. Bot. II. 8: 352: 
