44. 
formation of hormogonia. It seems, on the contrary, se: the 
whose cells have become surrounded with firmer membran 
portions 
es and 
—, conditions of Sirosiphonece have already been pevinier j 
see — September, 1892, Dr. Thos. L. Bancroft. 
Cate XL, Fig. 1, 2.) 
MICROCHETE, Thur. 
Thur, War. major, Moebius (n. var 
Moebius first gives s the following Latin description :-— Filis 
longis, 12-14 p crassis ; cellulis 8-10 ys crassis, inferioribus 
aullo longioribus, superioribus brevioribus. (Filaments 
dinners 
1 m 
ong, 12-14 p thick; celis 8-10 pthick, the lower somewhat longer chan 
the diameter, the upper y shorter.) The foregoing alga agrees su 
tially with Uf. tenera; itis in te however, by somewhat thicker 
flaments. The filaments form small flakelets attached to be ae 
eat: know teite Euro 
b.: Dalby, Desig Do Dowas, Dr. Thos. L. Bancroft. 
tPinte XL, Fig. 6- 
SCYTONEMA, 4 » prow ; 
. cincinnat Thur. Usually Pett dark-green poles 
floating mats, with filaments much interwoven. Vegetative cells ; 
often contracted at the margins, three to six cells to a diam wet 
contents eruginous. Heterocycysts short, elli soidal or gabon, — : 
or two (or more) in series of golden-yellow sok ; diameter the 
as the cells — ths pri 7 thin and colourless, 
8, pr 
Brazil, ope Sandwich "Jalands, and Sumatra.” 
Hab. : Charle 
ee rash Gully, Lower Freestone Creek, 
(Plate XI., Fig. 20.) 
— TT 
saint 
