Algse of the English Lake District. By Wm. West. 741 
Genus Lyngbya Ag. 
L. subtile sp. n. Fig. 58. 
L. solitaria et sparsa, trichomatibus subflexuosis, libere 
natantibus, distincte articulatis ; vaginis arctis, acbrois ; arti- 
culis diametro duplo ; cytioplasmate pallide serugineo et 
bomogeneo. 
Lat. fil. 1 • 5-1 • 8 /z. Bo., H., Bn., Scarf Gap Pass. 
This is one of tbe smallest species of tbe genus yet observed. 
The filaments are frequently interrupted in tbe sheath and single 
joints occasionally become separate, as well as parts of tbe filament. 
It is sufficiently distinct from L. hyalina Borzi (Nuova Notarisia, 
Apr. 1892, p. 40) which occurs in an olive-green stratum and has 
tortuose and intricate filaments, and its cells longer than broad. 
L. vulgaris (Kiitz.) Kirch. H. (at 2400 ft.). 
Genus Inactis Kiitz. 
J. tinctoria (A. Br.) Tbur. On Myriophyllum in Crummock 
Water. 
Genus Spirulina Link. 
8. oscillarioides Turp. B., Bn. 
var. minutissima (Bass.) Babb. Forma anfractibus laxis- 
simis, 1 in 38 /z. Crass, tricb. 2 /z. Bn. 
Sub-class Chroococcacese. 
Order Chroococcace.e. 
Genus Chroococcus Nag. 
*C, minor (Kiitz.) Nag. (Gatt. einz. Alg., p. 47, t. i. A, f. 4). 
H., Bt., S., L ., Ennerdale, near Bow Fell. 
*G, pallidus Nag. (l.c. p. 46, t. 1 a, f. 2). Sk., C. 
C. eohserens (Breb.) Nag. L., Sk., Bn. 
G. turgidus (Kiitz.) Nag. Frequent, 
var. violaceus var. n. 
Yar. cytioplasmate constanter violaceo. 
Diam. cell. s. teg. 14-18 /z; c. teg. 18-22 /z. 
Foot of Bow Fell, near Angle Tarn, along with 
Aphanothece saxicola Nag. and Gloeocapsa guater- 
nata (Breb.) Kiitz. 
C. giganteus sp. n. Figs. 59 and 60. 
C. cellulis magnis subsemicircularibus, plerumque binis 
(rarius quaternis) in familias consociatis ; familiis solitariis ; 
tegumento byalino, leve lamelloso (lamellis 2-3) ; cytioder- 
mate tenui ; cytioplasmate densissime seruginoso et granulato. 
Diam. cell. s. teg. 51-58 fi ; c. teg. 67-70 /z; crass, teg. 
5*4-6 /z. Bn., not uncommon. 
This differs from C. turgidus (Kiitz.) Nag. in its very much 
larger cells with relatively much thinner tegument. 
