Appendix B. MR. BERKELEY ON HIMALAYAN ALGJE. 379 



water of the pools scattered over the plains, on the Parang River, 

 separated only by a ridge of mountains from Piti, broad and foliaceous, 

 and scarcely different from the common Nostoc, which occurs in all 

 parts of the globe. I must not, however, neglect to record a very 

 singular new genus, in which the young threads have the characters 

 of Tyndaridea, but, after a time, little swellings occur on their sides, 

 in which a distinct endochrome is formed, extending backwards into 

 the parent endochrome, separated from it by a well denned mem- 

 brane, and producing, either by repeated pullulation, a compound 

 mass like that of Calothrix, or simply giving rise to a forked 

 thread. In the latter case, however, there is no external swell- 

 ing, but a lateral endochrome is formed, which, as it grows, 

 makes its way through an aperture, whose sides are regularly 

 inflected. I have given to this curious production the name of 

 Cladozygia Thomsoni. 



The whole of the above Algae occurred at heights varying from 

 10,000 to 15,500 feet. As in the Southern Himalayan Algse, the 

 specimens were infested with many Diatomacese, amongst which the 

 most conspicuous were various Cymbellce and Epithemice. The 

 following is a list of the species observed. 



Cymbella (gastroides). 



— (gracilis). 



— (Ehrenbergii) 



and three others. 

 Odontidium (hiemale). 



— (mesodori). 



— n. sp. 

 Epithemia n. sp. 



Epithemia n. sp. 

 Synedra (arcus). 



— (tenuis). 



— (cequalis). 

 Denticula (obtusa), 

 Gomphonema (abbreviatmn). 

 Meridiem circulare. 



There is very little identity between this list and that before given 

 from the Southern Himalayas, as is the case also with the other Algse. 

 Till the species, however, have been more completely studied, a very 

 accurate comparison cannot be made. 



In both instances the species which grow in hot springs have 

 been reserved in order to make their comparison more easy. I 

 shall begin in an inverse order, with those of the springs of Pugha in 

 Tibet, which attain a temperature of 174°. Two Confervce only occur 

 in the specimens which have been preserved, viz., an Oscillatoria allied 

 to that which I have called O. interrupta, and a true Conferva 



