1911] SHREVE—JAMAICAN HYMENOPHYLLACEAE IQI 
usually shaded and sprinkled by the overhanging leaves of the 
climbing fern Lomaria attenuata. Hymenophyllum asplenioides is 
quite as closely restricted to the most moist habitats as are any of 
the above-mentioned species, but the fact that its leaves are pendant 
confines its occurrence to tree trunks and rocks. 
Another group of species may be characterized, which are not 
sharply separable from the last, but are on the whole much more 
i G. 3.—A typical colony of Hymenophyllum sericeum, pendant from a horizontal 
imb ee. mats of Ptilidium; one-fourth natural size. 
capable of enduring desiccation and insolation. They are never 
found on the floor of the forest in ravines nor as low-growing 
epiphytes there, but are mid- height epiphytes in ravines and are 
found on the lowest layers of the slope forests. Their leaves are 
frect and glabrous, growing singly along a creeping rootstock 
and not exceeding tocm. in length in any species. These are 
Hymenophyllum polyanthos, H. fucoides, H. catherinae, H. tun- 
brigense, and Trichomanes crispum. Hymenophyllum polyanthos 
