ALEXANDER W. EVANS, Ph.D., EATON PROFESSOR OF BOTANY IN THE SHEFFIELD SCIENTIFIC SCHOOL OF YALE UNIVERSITY AS e76t V1 18 21015 V.-HEPATICAE: YALE PERUVIAN EXPEDITION OF 1911 BY ALEXANDER W. EVANS, Ph.D. INTRODUCTION The Yale Peruvian Expedition of 1911, under the direction of Professor Hiram Bingham, carried on extensive explorations in the southeastern part of Peru. Although the main purpose of the Expedition was the accumulation of data on the Geology and Archeology of the region, collections of invertebrate animals and of plants were made by Professor Harry Ward Foote, one of the members of the party. Instead of attempting to collect indiscriminately he wisely restricted his attention to a few definite groups, and the group of the Hepaticae was among those selected. The material of this group comprises thirty-five packets, several of which contain an admixture of two or more species. Thirty-one species in all, representing fourteen genera, are in a condition to be identified. The specimens came from seven different localities, namely: Cuzco (one species), Huadquiña (three), Lucma (five), Ollantaytambo (two), San Miguel (sixteen), Santa Ana (nine), and Urubamba (one). The following information about these localities has been furnished by Professor Foote. Cuzco, Ollantaytambo, Santa Ana, and Urubamba are all well-known towns, the last three being situated on the Urubamba River, which flows in a general northwesterly direction. Cuzco is a few miles distant from the river and nearer its source. San Miguel is a small district twenty or twenty-five miles below Ollantaytambo and is not to be confused with the town of San Miguel in the northwestern part of Peru; Huadquiña is a large estate lying a few miles below San Miguel; while Lucma is a town on the Vilcabamba River, a small branch of the Urubamba entering from the west a few miles south of Santa Ana. Cuzco, at an elevation of 11,500 feet, is well above the forest line, although a single species of tree was observed there. Urubamba, Ollantaytambo, and Lucma, at elevations varying from 7,000 to 9,500 feet, are also above the true forest line, in spite of the fact that several species of trees are of occasional occurrence. San Miguel, Huadquiña, and Santa Ana, at elevations varying from 3,000 to 6,000 feet are all in a region which is either forested now or has been in former times. The primary growth |