THE BRYOLOGIST. 
Vol. VII. September, 1904. No. 5. 
HYOPHILA- A NEW GENUS TO THE UNITED STATES. 
By Elizabeth G. Britton. 
Prof. Max Fleischer, whose studies on the moss-flora of Buitenzorg have 
made him familiar with Hyophila Javanica has called my attention to the 
fact that the much-named Pottia riparia Austin is really a species of 
Hyophila. I have made comparisons of the specimens and illustrations 
and find that he is correct. 
The following generic description and synonymy have been adapted from 
those given by Brotherus in “ Die Natiirlichen Pflanzenfamilien ” : 
Hyophila Brid. Bryol. univ. 1 : 760. 1826. 
Rottleria Brid. Bryol. univ. 1 : 105. 1826. not Willd. 1797 . 
Pottia section Hyophila CM. Syn. Muse. 1 : 558. 1849. 
Weisia section Hyophila Mitt, Jour. Linn. Soc. 12: 135. 1869. 
Plants growing in low, dark green or brown tufts. Stems radiculose at 
base, branching; central strand present. Leaves crowded, inrolled and 
curled when dry, spreading when moist ; base clasping, oblong ; apex ellip- 
tic, obtuse or acute, entire or serrate: costa stout, ending in or below the 
apex or rarely short excurrent ; cells smooth or slightly papillose. Dioicous. 
Perichetial leaves smaller or not differentiated, Seta exserted, slender, 
erect. Capsule erect, mostly small cylindric, or oval ; annulus differentiated 
and deciduous. Peristome lacking or rarely present and short ; lid conic or 
rostrate, cells in straight rows; calyptra cucullate; spores small. 
A genus represented in all the larger Continental areas and archipela- 
goes by seven-nine species, of which thirty-two, according to Brotherus, are 
known in America, twenty-two in South and five in Central America, four in 
the West Indies, and one in the United States. 
Hyophila riparia (Aust.) Fleischer, M. S. in Austin Herb. 
Pottia riparia Aust. Musci App. No. 112. 1870. 
Trichostomum Warnstorfii Limpr. Laubmoose. 1: 587. Fig. 171. 1888. 
Leptodontium Canadense Kindb, in Mac. Cat. 6: 45. 1892. 
Leptodontium riparium Britt, in Bull. Torr. Club, 19: 275. 1892. 
Didymodon riparium Kind. Br. Eu. & N. Am. 2: 280. 1897. 
Plants )/ 2 cm. high; stems branching, branches about 1 cm. long; leaves 
crowded when dry about y z mm. long; cells square and small .005-013 mm., 
Plate X. Hyophila riparia. This plate has been reduced one-half 
from the magnifications indicated for each figure. 
1. Perichaetium dissected, showing one archegonium and four gemmiferous 
paraphyses, X 160. 
2. Branched paraphyses with gemmse, X 160. 
3. & 4. Two paraphyses enlarged 340 diameters. 
5. One of the gemmse magnified 470 diameters. 
The other gemmse show various forms and have been enlarged 340 
diameters. 
The July Bryologist was issued July 1st, 1904. 
