BLUE-GREEN ALGAE FROM LAHORE AND SIMLA. 33 
8. Microcystis DoxxELLI, Wolle, in Bull. Torr. Bot. Club, vi. 1879, p. 282. 
Diam. cell. = 3 y. 
Hab. Lahore, in stagnant rain-water pools, mostly adhering to submerged 
objects, but sometimes free-floating ; October-March. 
9. CLATHROCYSTIS ÆRUGINOSA (Kütz.), Henfrey, in Mier. Journal, 1856, 
p. 53, pl. 4. figs. 28-36. 
Diam. cell.z 3-4 u. 
Hab. Lahore, on the surface cf quiet stagnant water, forming a dirty green 
seum, whieh presents to the naked eye a finely granular appearance ; 
October-March. 
CHAMZESIPHONACE.E, 
10. CHAMASIPHON FILAMENTOSA, sp. n. (P1. 81. fig. 1.) 
Plantis solitariis vel fasciculatis ; gonidangiis maturis 4-6 y crassis, usque 
ad 200 longis, filamentosis, basin versus in stipitem attenuatis; vaginis 
achrois; gonidiis numerosis, 5-6 í crassis, doliformibus, protoplasmate 
granuloso. 
Hab. Lahore, in a stagnant pool of water in the Botanical Gardens, 
growing on a species of Pithophora ; October 1918. 
This species resembles C. confervicola, A. Br., but differs from it in two 
respects: first, the gonidangia are very long (up to 200) and filamentous, 
whilst even in C. confervicola var. elongata Rab. they are only 224 long ; 
secondly, the gonidia are barrel-shaped, while in C. confervicola they are 
shorter than long or seldom quadrate. 
OSCILLATORIACELE. 
11. OSCILLATORIA PRINCEPS, Vauch.; Gomont, Monogr. Oscill. 1893, 
p. 226, pl. 6. fig. 9 ; var. PSEUDO-LIMOSA, var. nov. (PI. 81. fig. 2.) 
Strato obscure æruginoso ; trichomatibus rectis, rigidis, flavo-viridibus, 
siceitate fragilibus, non-torulosis, 31-35 y crassis ; articulis brevissimis, pro- 
toplasmate granuloso; apicibus plerumque haud attenuatis et vulgo rectis ; 
cellula apicali superne leviter convexa ; calyptra nulla ; dissepimentis non- 
granulatis. 
Hab. Lahore, in a slow-flowing dirty drain, at first attached to the mud, 
then free-floating ; found only once, in September, 1918, in spite of all efforts 
to find it again. 
This variety differs from the typical form of the species in not having a 
clearly tapering and curved apex. The majority of the filaments have a 
straight broad apex like that of O. limosa, Ag., to which, however, I do not 
refer this alga because of its much greater thickness and the absence of any 
granulation at the transverse walls. Boergesen (Freshwater Alge of the 
