44 TORTULACEAE 



B. convoluta Hedw. On ashes, Lakehurst, N. J.!!; Demarest, 

 Hoboken and Palisades, N. J., Austin, Bx! According to R. 

 S. Williams, Muse. App. 122 (Desmatodon arenaceus) is this 

 species, at least in part. 



B. fallax Hedw. On stones and soil, Hoboken, N. J., Austin, 

 Bx! My specimen of Muse. App. 125 is B. unguiculata, at 

 least in part. I have not examined the Hoboken specimen. 



B. reflexa Brid. (B. recurvifolia Schimp.) is a variety or sub- 

 species of B. fallax, distinguished by its reddish brown color, 

 strongly squarrose-recurved lower leaves, broader, shorter and 

 abruptly pointed. "On rocks, Hoboken, N. J.," Muse. App. 

 Suppl. 496. 



B. unguiculata (Huds.) Hedw. On damp earth and stones, 

 frequent. Autumn to spring. 



DIDYMODON Hedw. 



Leaves mostly lanceolate from a broader base, somewhat 

 contorted when dry but scarcely crispate, margins revolute; 

 upper cells small, roundish quadrate, nearly smooth to strongly 

 papillose, sometimes elongated and transparent at base. Cap- 

 sule oblong to cylindric, not altering when dry; operculum conic 

 and beaked; peristome of J 6 teeth, undivided, perforate, or divided 

 nearly to the base as in Ceratodon, short, not twisted. 



D. rubellus (Hoffm.) B. & S. "On rocks along streams, 

 northern N. J.," Muse. App. 143. Summer to autumn. 



TRICHOSTOMUM Hedw. 



The genus differs from Didymodon in having the leaf-margins 

 plane or incurved, and in the elongated-rectangular or linear 

 basal cells. Distinguished from Tortella by the short un- 

 twisted peristome and the fact that the basal cells do not extend 

 up the margin. 



T. cylindricum (Bruch) C. Mull. (Didymodon cylindricus 

 Wahl.) "Moist rocks and banks, Northern N. J., also Southern 

 and Central N. Y.," Muse. App. 114; Orange, Bry. Ct. Rarely 

 fruiting. 



