144 SIPHOPHYCE, 
directed one way, which gives the plant a peculiar clustered or tuft- 
like aspect. Articulations at least five times longer than they are broad.” 
—Eng. Bot. 
Plate LVI. fig.1. Portion of apex of thread slightly enlarged. Fig. 
2, portion of branch X 100. Fig. 3, tip of branch with zoogonidia x 200 
diam. Fig. 4, zoogonidia x 320. 
Cladophora flavescens, Ag, Syst. p. 112. 
Pale yellowish, six inches long, very much branched, fascicu- 
late in a plumose manner, branches patent, ultimate branchlets 
often rather clavate, patent or incurved, cell-membrane often 
distinctly plicate, cell contents distributed in a reticulate manner. 
Size. Diameter of branches -07--08 mm., 6-12 times as long. 
Cladophora glomerata, v. flavescens, Rabh. Alg. Eur. iii., 342. 
Cladophora flavida, Kutz. Sp. Alg., p. 402. 
Conferva flavescens, Eng. Fl. v., p. 856. Dillw. Conf. Supp., 
t.z. Harv. Man. 133. Eng. Bot. i, t. 2088; ii, t. 2493 ; 
Wyatt Alg. Danm., No. 224. Mack. Hib, 227. Gray Arr. 
1, 304. 
Conferva pinnatula, Dillw. Conf., t. 95. 
In ditches or pools of brackish or fresh water. 
“ This species grows in continuous tufts, which, as they rise to the sur- 
face, form extensive floating strata covering the pool. Filaments slender, 
capillary, tangled together, irregularly branched ; the main thread some- 
what dichotomous, with widely spreading axils, and often bent in an 
angular manner first to one side then to the other ; the lateral branches 
alternately divided, patent, with a few distant, scattered, alternate, or 
secund ramuli, Articulations cylindrical, many times longer than broad, 
filled with a pale, granular endochrome. Colour when young, a yellowish 
green, becoming yellower in age, and at last almost golden. When dry 
it has a silky appearance, and fades in the herbarium to a yellowish 
white. Substance soft, membranous, but not strongly adhering to 
paper.” —Harvey. 
Besides its pale green colour it is readily distinguished from C. fracta 
by the much longer articulations, and their less granular contents. 
Plate LV. fig. 5. Upper portion of filament of Cladophora flaves- 
cens X 10. Fig. 6, portion of filament with fertile terminal cell x 100, 
Fig, 7, apex of terminal cells, with zoogonidia escaping x 200. 
Cladophora canalicularis. (Roth.) Aut:. Sp. 409. 
Dichotomously or trichotomously branched, branches connate 
at the base, often fasciculately branched above as in C. glome- 
rata. Fructiferous cells terminal. Cell- membrane often thick, 
now and then swollen. Cell contents arranged in very lax spirals. 
Size. Lower branches ‘08-"12 mm., 4-8 times as long. 
Rabh. Alg Eur. iii., 342. 
Alga in tubules aquam fontanam deducentibus, Dill. Musc., 
t. 4, f. 15. 
Conferva canalicularis, Sibth. Ox.,336. Hall Br. Fl., 331. 
Abbot Fl, Bedf. 274. With. Arr. iv., 129.  Relh. Cant. 
443. Huds. Fl. Angl. 593. Purton Mid]. Fl. ii., 610. 
