ON A COLLECTION OF BLUE-GREEN ALG, 333 
A Systematic and Ecological Account of a Collection of Blue-Green Algæ 
from Lahore and Simla*. By S. L. Guosz, M.Sc. (Communicated by 
Prof. F. E. Furrcg, D.Sc., F.L.S.) 
(PLATE 31.) 
[Read 3rd May, 1923.] 
INTRODUCTION. 
PRACTICALLY no work has been done on the Myxophyceæ of India. With 
the exception of a few records of certain Indian species by Schmidle f, 
Turner t, West §, and Gomont ||, nothing is known about them. None seem 
to have been recorded from the Panjab Plains, and for this reason a 
systematic study of the blue-green algæ of certain localities in the Panjab 
was thought to be desirable. Accordingly, a collection of the Myxophyceæ 
from Lahore was made by the writer during the years 1917-19. A few 
specimens were also collected at Simla, which differs in climate and altitude 
from Lahore, with the object of making a comparison as to the time of their 
vegetative occurrence and spore-formation at the two stations. In these 
collections 41 species representing 23 genera were found, of which 9 species 
and 3 varieties are new. 
Lahore is situated in latitude 31° 35’ N. and longitude 74? 20' E. at a 
height of about 700 feet above the sea-level. The hottest months, namely 
May and June, have a mean maximum temperature of 106° F. ; the highest 
temperature recorded being 120? F. The coldest months, namely December 
and January, have a mean minimum temperature of 40° F., the thermometer 
never falling below 29° F. The rainfall is confined chiefly to the months of 
July, August, and September, and ranges between 8 and 25 inches per 
annum. 
Simla lies in latitude 31? 6' N. and longitude 77? 10' E., at an altitude of 
about 7,000 feet above sea-level. The mean temperature of January, the 
coldest month, is 40:6? F., and that of June, the warmest month, is 67:1? F. 
* From the Botanical Department, East London College (University of London). Part ot 
this work was done in the Government College Laboratory, Lahore, and in the Botany 
School, Cambridge. 
T Schmidle in Hedwigia, xxxix. 1900, and Allg. bot. Zeitschr. vi. 1900. 
t Turner, W. B., “Algæ aque dulcis Indie Orientalis," K., Vet.-Akad. Handl. xxv. 
Nr. 5, 1892. 
$ West, W. and G. S., “Algæ of Burmah,” in Ann, Roy. Bot. Gard., Calcutta, vi. 1907. 
|| Gomont, M., in Bot. Tidsskrift., xxiv. 1901, p. 202. 
