55 
Famiry XIJ.—OSCILLARIACEA;, Stiz. et Rabh. 
Lyngbye, in Cooke’s British Freshwater Alge, with the following 
description :—“ Filaments without heterocysts, and destitute of a 
terminal hyaline hair, single and scattered, or numbers associated in 
bundles and enclosed in a common sheath, often radiating. Joints 
shortly cylindrical, disc-shaped in section.” 
LYNGBYA, Ag. em Thuret. 
Filaments enclosed singly in a sheath, simple, or only sor foart 
ally exhibiting the beginning of rami cation where the trichome issues 
from the side of the sheath; often combined in a membranaceous 
stratum. 
L. solitaris, Kirchn. Prof. Moebius gives the following note :— 
«Threads with sheath 8-9 » thick, sheaths thin, joints clearly es 
i i e am 
not aware whether this alga has also been found out of Europe.” 
ab: Nines Waterhole, Myrtle, Thos. L. Bancroft. 
L. obscura, Kuctz. “Threads rd een as much as 24 » thick, 
sheaths thick and stra tified ; cells 14-1 ae 4-6 times shorter. 
Known in Europe and No rth Arnetion? 1” Mochi 
Hab.: In waterholes, Victoria Park, Thos. L. oa 
cae emma Bose. 
te cr coloured aie eed, eee vane scabies &e 
-)s 
motile, nestling in a matrical mucilage ; joints dise-sha d in the front 
view, without a ae distinct from the trichome.—Cooke’s British 
lar. Size: Threa , 003mm ooke, l.c 
Prof. Moebius vives the eaae note :—“ ‘Recognisable _ 
lo ng-pointed sometimes curved ends and the joints, which a 
-3 times as long as thick, Threads 3 p thick, ara oer ay 
"hag much as 1°5 The threads are sometimes t and the 
wisted portions wound round each other. (Fig. 51. 
0. Hab.: In waterholes, Victoria Park, Thos. Z. Bancroft. Also in Europe. 
}: tenuis, (4 Kirchn. (2). Forming a bright green or dark 
Mie green statin shortly, ow date: : trichomes straight, 
Nigid, more or less endowed with’ active motion ; joints equa 
; tn on fay as broad, sometimes a little constrict e 
tenuate, which are delicately granulated; apex bl 
Siz erga obtuse, curved or —— cell-contents pale watery blue. 
** Threads, 0:054-006 mm. diam.—Cooke’s Freshwater Alg. 
Its 
15 
