

, CATALOGUE OP SPECIES. 233 



The Cladophora occurs in simple spherical masses varying in size from minute 

 bodies to balls a centimeter in diameter. These balls float in great abundance upon 

 the water, on the leeward shore of the lake often entirely covering the surface. 

 Soon after attaining their full size the balls disintegrate into an amorphous, slimy 

 mass. The plant is of interest as exhibiting the possibility of the existence of plant 

 life in water so intensely alkaline. 



VOLVOCACE.SJ. 



Chlamydococcus nivalis A. Br. 



The so-called red snow of alpine regions was seen frequently about Farwell Gap 

 and at other points in the vicinity of timber-lino in the high Sierra Nevada. The 

 moist snow presents in spots a beautiful pink color, in clear contrast with the white 

 of other portions. When examined in the hand the snow looks precisely as if 

 it had been stained with a pale-red fluid, and does not show any red corpuscles. 

 No microscopic examination of the minute alga could be made. 



ZYGNEMACEiE. 

 Spirogyra. 



Plants of this genus, but not in condition for specific identification, were seen at 

 a few points in the desert, such as Furnace Creek and some of the springs in Owens 

 Valley. 



NOSTOCACEiE. 



Nostoc verrucosum Vaueher. 



Cottonwood Springs, Vegas Valley, Nevada (No. 391). Determined by W. G. Far- 

 low. 



STJMMATIY OF CATALOGUE. 



The number of new species and varieties brought to light by the 

 expedition up to the present time is 42, a few other apparently unde- 

 scribed plants, not mentioned in the catalogue, having been laid aside 

 -for future consideration. The names of the new plants are printed in 

 heavy-faced type in the index of the report. Two new genera have been 

 erected, Orochcvnactis and Phyllogonum, the former based on a species 

 heretofore referred to Chcenactis, the latter on a newly discovered plant. 

 The whole number of species and varieties enumerated in this cata- 

 logue is 1,261. It should be understood, however, that the desert region 

 of California, of which Death Valley forms a part, does not contain all 

 these twelve hundred species. More than one-half of them were col- 

 lected either in the Sierra Nevada and its southern continuations, or 

 in the Tulare Plains, areas with vegetation almost wholly different from 

 that of the desert region. A list of the plants found in the Lower 

 Souoran zone of the desert is given on pages 31) to 41. 



