296 Alexander W. Evans, 



contains a large proportion of trees, but the secondary growth con- 

 tains few trees and many bushes. There seems to be Httle tendency 

 for the original species to reappear after deforestation, even if the 

 land is left completely uncultivated. The entire region explored 

 has a long dry season and suffers from lack of water. 



The hepatic flora of the Andes, except at very high altitudes, is 

 rich and varied. It includes some of the largest and most conspic- 

 uous of the leafy forms, a great many smaller and less striking spe- 

 cies, and a fair proportion of thallose representatives. The number 

 of endemic genera is exceedingly small, Myriocolea Spruce (with one 

 species), Mytilopsis Spruce (also with one species), and Stephaniella 

 Jack (with two species) being the only ones known at the present 

 time. Most of the Andean species belong to large and widely distrib- 

 uted genera, such as Pla^iochila, Radula, Porella, and Frullania. 

 The Lejeuneae, also, as in most tropical regions, are numerous and 

 diverse. Certain genera, such as Gyninomitrium, Marsupella, Lopho- 

 zia, and Scapania, which are so richly developed in the arctic and 

 alpine districts north of the tropics, are either absent altogether 

 or very sparingly represented. In the present collection there are 

 three thallose species (one Plagiochasma, one Marchantia, and one 

 Metzgeria), nine Plagiochilae, five Frullaniae, and nine members 

 of the Lejeuneae. The remaining five species belong to the genera 

 Lophocolea, Radula, and Porella. Six of the species are apparently 

 undescribed ; the others include a number of widely distributed species 

 and a somewhat smaller number confined to the Andes. The geo- 

 graphical distribution will be more fully considered in connection 

 with the individual species. The type-specimens of the new species 

 will be deposited in the herbarium of the writer at New Haven, 

 Connecticut. 



Several important works dealing wholly or in part with the Hep- 

 aticae of the mountainous portions of Mexico, Central America, and 

 South America, have been pubHshed, although nothing has yet 

 appeared which deals exclusively with the Hepaticae of Peru, The 

 following works have been of especial service in the study of Pro- 

 fessor Foote's material, although numerous shorter papers have of 

 course been consulted: 



MoNTAONE, C. Florula Boliviensis. In d'Orbigny, A., Voyage dans 

 I'Amerique Meridionale. T: i-ii^, pi. 1-3. 1839. The Hepaticae 

 treated in this work were, for the most part, collected by Alcide 

 d'Orbigny during the years 1826—1833, in various parts of South 

 America. Among the species discussed forty-five came from Bolivia, 

 ten of which at that time were supposed to be endemic. Seven 



