BLUE-GREEN ALGÆ FROM LAHORE AND SIMLA. 345 
This species shows intermediate characters between Canpylonema lahorense 
and Tolypothrie. It resembles the former in the erescentic shape of the 
filaments, in having single or geminate pseudo-branches, which may or may 
not be related to the heterocysts, but it differs from it in having no median 
heterocysts and in its preponderant Tolypothriv-like branching. 
39. TOLYPOTHRIX CONGLUTINATA, Borzi, in Nuov. Giorn. Dot. Ital. xi. 
1879, p. 371 ; Fritsch, Rep. National Antarctic Expedition, Natural History, 
vi. 1912, p. 38, pl. 3. figs. 145, 146 ; var. COLORATA, var. nov. (PI. 81. fig. 13.) 
Strato primum æruginoso, deinde obscure fusco-viride, floccoso et tomentoso; 
filamentis irregulariter et dense intricatis, trichomatibus ærugineis, 7-9 u 
crassis, ad genicula constrictis ; cellulis diametro brevioribus, protoplasmate 
granuloso; pseudo-ramis multis, brevis et flexuosis, solitariis vel raro 
geminatis ; vaginis crassis, asperulis, primum achrois, deinde luteo-fuscis ; 
heterocystis solitariis, globosis sed leviter deplanatis, circa 8 u diametro. 
Hab. Simla, on damp rocks and moist exposed roots of trees ; August 1919. 
This variety differs from the type mainly in having a coloured sheath in 
older filaments. Moreover, its stratum is felt-like and not gelatinous- 
crustaceous, like that of the type. The heterocysts, which are often paired, 
are not quite spherical, but in most cases distinctly drawn out in the trans- 
verse direction. 
RIVULARIACEX. 
40. CALOTHRIX PARIETINA (Nüg.), Thur. ; Born. & Flah. in Ann. Sei. 
Nat. Bot. ser. VIL, vii. 1886, p. 366. 
Diam. fil. ad bas.— 10-12 w; diam. trich. ad bas.= 8-10 p ; diam. hetero- 
cyst.= 8 w; crass. parietis vagine= 175 a. 
Hab. Lahore, in stagnant rain-water pools, adhering to submerged leaves 
in association with species of (Ædogonium ; October-March. 
41. RIVULARIA NATANS (Hedw.) Welwitsch ; Born. & Flah. op. cit. 1886, 
p. 369. (Gleotrichia natans, Rabenh. Deutschl. Kryptogamenfl. 1847, 
p. 90.) 
Diam. trich. ad bas.= 9-10 p; diam, tegument.= ad 40 u ; diam. spor.— 
18-24 4; long. spor.= 60-70 u. 
Hab. Lahore, in small pools near the River Ravi, the colonies generally 
adhering to the sides, sometimes free-floating ; October-March. 
CONCLUSION. 
In conclusion, 1 have much pleasure in expressing my heart felt thanks to 
Dr. F. E. Fritsch, Professor of Botany, East London College, for generous help 
and guidance during the preparation of this paper. Without his help it 
LINN. JOURN.—BOTANY, VOL. XLVI. 26 
