468 PROF. D. H. CAMPBELL ON THE 
him to leave incomplete, and it was with the hope of clearing 
these up, as far as possible, that the present work was 
undertaken. 
During a visit to Jamaica in the summer of 1897, Dendroceros 
was met with several times, and an abundant supply of material, 
preserved in chromic acid and in alcohol, was procured. Exami- 
nation of this showed that all stages of development were 
present, and although the study made was hardly an exhaustive 
one, it is believed that the most important gaps left by Leitgeb’s 
investigations have been filled. 
The common species, to judge from a comparison with 
Leitgeb’s description of the genus, was D. Breutelii, Nees, 
but a second species, possibly D. crispus, Nees, occurred 
growing with the first. As the two are much alike in appear- 
ance it was supposed that we had only one species, and it was 
not until the investigation of the ripe sporogonium was made 
that the error was discovered. It was therefore impossible to 
decide from which species some of the preparations were made, 
as they seem to agree almost exactly in everything except the 
character of the spores and the cells of the sporogonium-wall. 
All the species of Dendroceros are epiphytes, in this respect 
differing from the other genera, which are mainly terrestrial. 
They grow upon the stems and twigs of small trees and shrubs, 
near the ground, and also may cover the upper surface of the 
leaves. Most of the specimens were collected at an altitude of 
between 1000 and 2000 feet, where the precipitation was very 
heavy and the tropical conditions pronounced. Most of my 
material was procured in the mountains south of Port Antonio 
on the road to the Cuna Cuna Pass. Here the plants o ccurred 
in great profusion, covering the stems and lower twigs ofa 
number of shrubs, especially a species of Eugenia, probably t i 
common Rose-apple, E. Jambos, Linn. In this case the broa 
evergreen leaves were often almost covered with the Dendroceros 
and other epiphytic hepatics. . 
The thallus of Dendroceros is at once distingu! 
of the other Anthocerotaces by the possession of à looks 
midrib, with a more or less lobed lamina on either side. It loo e 
quite like a Fossombronia in habit, but the microscope at “hen 
reveals the single chloroplast in each cell, so that even ¥ 
sterile the plant is unmistakable. 
The sporogonia are produced freely, bu 
shed from that 
definite 
t are not 80 numerous 
