454 MR. N. D. SIMPSON ON THE PLANTS OF 
ELYMUS DAsYsTACHYS, Trin. 
No. 116. Stony deserts on hill-sides and in plateau valleys up to 2050 m. 
under the driest vegetative conditions. In the Suok Valley and on the N. side 
of the Great Altai Range. 
No. 453. Dry valley steppe, alluvial soil often where flooded and where 
there is a little moisture, on the banks of the Ulu Kem. 
No. 453 agrees in structure with Æ. dasystachys, but the plant is remarkable 
for its slender form and its one-flowered spikelets. 
Distribution. Siberia, Mongolia. Turkestan, China, Japan, Pamir, and 
N.W. India. 
ELYMUS GIGANTEUS, Vahl. 
No. 176. Medium dry conditions, sand dunes and sandy silt deposits just 
above the water-table; sandy plains of the Upper Irtish basin. 
Distribution, Russia and the Altai region. 
PTERIDOPHYTA. 
FILICINEJZE. 
NEPHRODIUM SPINULOSUM, Desv. 2 
No. 308 a. Picea and Pinus forests under the wettest conditions, belonging 
to the typical Amil River flora. 
This specimen and the following are too young for certain identification. 
NEPHRODIUM SPINULOSUM, Desv., var. DILATATUM, Look. ? 
No. 308 b. 
Distribution (of species). Europe, Asia, Eastern Himalayas, and N. America, 
Christensen. 
CysTcPrERIS FRAGILIS, Linn. 
No. 342. On a basalt cliff, Amil River, Petrapolowsk. | Used by the 
Russians for medicinal purposes. 
Distribution. Arctic, antarctic, and temperate regions and alpine tropical 
regions, Christensen. 
Potypopium DRYOPTERIS, Linn. 
No. 308 v. 
j 1 j (\ IT 4 X 1 э, . "us 1 a " M 
Distribution. Europe, Asia, W. America, arctie and temperate regions, 
Christensen, 
