BLUE-GREEN ALGÆ FROM LAHORE AND SIMLA. 341 
97. ANAB-ENA VARIABILIS, Kütz. ; Born & Flah. op. cit. p. 226. 
Diam. cell.— 4-5 u ; diam. spor. = 8-12 u. 
Hab. Lahore, on moist ground. It occurs most abundantly during the 
months February to April. Spores are formed in Mareh and April. At 
Simla it was collected, with ripe spores, in the month of September, adhering 
to damp rocks. 
98. ANABÆNA SPIROIDES, Klebahn, var. CONTRACTA, Klebahn, in Flora 
1895, p. 29, pl. 4. figs. 14, 15. 
Diam. spir.= ad 20 p; diam. trich. = 5-7 y. 
Hab. Lahore, free-floating in stagnant water, generally associated with 
Clathroeystis ceruginosa ; October-March. 
Heterocysts were rare and no spores were observed. 
99. ANABÆNA GELATINICOLA, sp. n. (Pl. 81. fig. 8.) 
Strato crasso, gelatinoso ; trichomatibus plerumque solitariis, in spiram 
contortis interdum in partes rectas transientibus; articulis sub-spheericis, 
6—1:5 p crassis, apicibus acutis, protoplasmate granuloso; heterocystis 7-8 u 
crassis, globosis ; sporis in seriebus dispositis ab heterocystis remotis, 
sphæricis, circa 14 p diametro. 
Hab. Lahore, on moist ground ; September-March. 
This species resembles A. spiroides and A. Flos-aquæ (Lyngb.), Bréb. in 
having spirally twisted trichomes, but differs from them in two important 
respects. First, it is not planktonic like these two species ; secondly, the 
spirals are densely arranged, so that the trichome generally presents a coiled 
and not a corkscrew-like appearance. In A. F'los-aque, var. circularis, G. S. 
West, the trichomes are, however, coiled, but make only 1-14 turns, while in 
the present species there may be as many as ten turns lying in one horizontal 
plane. Moreover, A. gelatinicola differs from A. Flos-aque in having 
spherical and not elongated spores. 
30. CYLINDROSPERMUM STAGNALE (Kütz.), Born. & Flah. op. cit. p. 250. 
Diam. trich.= 4-5 ; diam. heterceyst.= 6-7 p; long. heterocyst.= ad 
11 u; diam. spor.— 10-14 p ; long. spor. = ad 35 a. 
Hab. Lahore, on moist soil, constantly wetted, such as that round water- 
pipes and drains ; September-March. 
31. CYLINDROSPERMUM LICHENIFORME (Bory), Kütz.; Born. & Flah. op. 
cit. p. 253. 
Diam. trich.= 4 p ; diam. heterocyst.— 5-6 y ; long. heterocyst.= 7-10 y ; 
diam. spor.= 12-14 p ; long. spor.= ad 40 p. 
Hab. Simla, on moist sheltered rocks ; August and September 1919. 
