( 104 ) 
Bolivian Mosses. Part I. 
By R. S. WILLIAMS. 
The following list of mosses includes species collected by 
the author while attached to a party in charge of Dr. John 
W. Evans, sent out to Bolivia for the purpose of exploring 
certain regions on tributaries of the upper Amazon for The 
Bolivia Company. Our party landed early in August, rgo1, 
at Mollendo, passed through Peru and over Lake Titicaca, 
first to La Paz, reaching that city August 13, where we re- 
mained some days making farther preparations for the trip. 
From La Paz, 3500 meters elevation, we went to the town of 
Sorata, 1200 meters lower, then over several high passes of 
the Cordillera Real, the highest attaining an altitude of about 
4860 meters, by way of Ingenio and Tolapampa, to Mapiri 
on the Mapiri River with an elevation of only 485 meters. 
Here we obtained balsas and floated down the Mapiri and 
Bini Rivers to San Buena Ventura, 430 meters elevation and 
the lowest point reached on the trip. Leaving the river at 
this point we went to the westward, visiting the towns of 
Tumupasa, San José and Ixiamas, in the lower forest region, 
then going to Apolo, a town situated at 1440 meters elevation 
in an open, nearly treeless valley, with low, grass-covered 
mountains on either side. We remained here from the mid- 
dle of February, 1902, until the latter part of April, making 
one trip, meanwhile, northwestward through forests to the 
Lanca river, which occupied nearly a month’s time. April 
24, we left Apolo for La Paz by way of the Pelichuco Pass, 
quite a number of miles to the northward of the Sorata-Mapiri 
trail, and passed through the towns of Santa Cruz, Pata and 
Pelichuco in Bolivia and Cojata, Taraco, Juliaca and Puno, 
on the high tableland of Peru, about 3950 meters elevation. 
From Puno, the railway station on Titicaca, our route was 
the same as that first traversed to La Paz. Shortly after 
reaching that city, instead of returning home at once, two 
