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Correns Fig. 70 . 
3. Zygodon gracilis Wils. Berk. Handb. Brit. Mosses 219, 1863. 
Leptodo?itium gracile De Not. Cronaca, 1868. 
Amphoridium gracile De Not. Epil. 278. 1869. 
Trichostomum gracile Mol. Bay, Laubm. 79. 1875. 
Zygodon Now el lii Sch. Syn. 297. 1876. 
Didymodon subalpinus Card. Rev. Bryol. 14 ; 21. 1887. 
Plants in dark green dense cushions on rocks, 2-7 cm. high; stems 
branched and matted with brown tomentum, stout or slender when pendent; 
leaves crowded or distant on young branches, spirally twisted when old, 
spreading or recurved when moist, lanceolate, 2-2.5 mm. long, carinate; costa 
stout, ending below the mucronate apex, papillose on back ; margins 
sharply serrate above, entire below, long decurrent at base; cells densely 
papillose, alar rectangular, clear and smooth. “ Dioicous. Perichaetial 
leaves not differentiated. Seta 8 mm. long, exserted ; capsule erect, cylin- 
dric, striped and plicate when dry, with a narrow mouth; lid apiculate; 
annulus very broad, persistent ; peristome double ; teeth united in pairs, 
cilia 8, of 2 rows of papillose cells; spores .012-014 mm. smooth. Ripe in 
August.” 1 Quoted from Limpricht; fruit not seen ! 
Easily distinguished from Barbula rejlexa for which it is liable to be 
mistaken, by its sharply serrate leaves. 
Type locality; Yorkshire, England. Nowell, 1856. 
Distribution; England and Ireland rare! Fruit scarce. Also in 
Switzerland, Bavaria and the Tyrol. First discovered in America by Dr. A. 
J. Grout in great abundance on the faces of cliffs on Chestnut Bald, North 
Carolina, 6000 ft. elevation. Aug. 1907. 
Exsiccatae: Wilson Musci Brit. No. 200, 1862, and Holzinger Musci 
Acrocarpi Boreali-Americani. 
Illustrations; Limpricht Laubmoose 2: fig. 214. 1895. 
1. Limpricht Laubmoose 2: 14. 1895. 
