572 Williams : Mosses from tropical America 



Leptodontium perannulatum sp. nov. 



Dioicous : c? plant slender with bud-like flowers a little over i 

 mm. high, the antheridia 0.8 mm. long with rather abundant para- 

 physes ; antheridial leaves costate, smooth, entire, ovate, acutely 

 short-pointed : fertile plants in rather compact tufts with usually 

 slightly branching stems up to 8 cm. high, dark-brown below, 

 yellowish toward apex and with radicles mostly inconspicuous ; 

 stem-leaves more or less twisted-carinate, spreading or recurved 

 when dry, recurved from near base when moist, up to 3.5 mm, 

 long, oblong-lanceolate, recurved on the margin below, gradually 

 narrowed to an acute, irregularly serrulate apex with costa nearly 

 percurrent ; cross-section of costa showing about 4 large cells with 

 stereid bands of about one row of cells above and two rows below ; 

 cells of leaf-base yellow, linear, smooth with sinuously thickened 

 lateral walls, cells above papillose, mostly irregularly oblong with 

 much thickened walls, the median cells about 6 ij. by 10 ij.; peri- 

 chaetial leaves up to 10 mm. long, smooth, costate to near apex, 

 sheathing over one half up, gradually narrowed to a flexuous, dis- 

 tantly serrulate apex : pedicel i cm. high ; capsule ovate-cylind- 

 rical, slightly curved and nodding, small-mouthed, 3 mm. long with 

 a stoutly-beaked lid 0.8 mm. long ; peristome-teeth lanceolate, 0.2 

 mm. long, pale golden-brown, glabrous, articulations often indis- 

 tinct, more or less irregularly split longitudinally ; annulus broad 

 persistent, 7 or 8 rows of cells high, the upper rows of loosely 

 cohering cells ; spores rough, up to 22 fi in diameter. 



Volcan de Agua, on sheltered rocks, 3400-3750 meters, March 

 22, 1905, H. Pittier {42). This species is near L. breviseium Mitt., 

 from which it may be distinguished by the leaf-cells. In L. brnd- 

 setiuii the median cells are smaller (mostly 5 // by 5 to 6 fi) scarcely 

 elongated or often slightly transversely elongated and with cell- 

 walls thinner and straighten In the Mitten herbarium a few frag- 

 ments of this apparently undescribed species were found, evidently 

 from the same locality as Pittier's specimens, but without date or 

 collector, and were on the same sheet with L. brevisetum. 



CUBAN MOSSES COLLECTED BY W. R. MAXON 



Holomitrium Maxoni sp. nov. 



Inflorescence not determined : plants in rather dark-green 

 tufts with stems, bearing few branches, up to 8 mm. high : leaves, 

 when dry, incurved-imbricated with margins above rolled in, when 

 moist, more or less recurved and widely spreading, in outline nearly 

 linear, up to 2.5 mm. long and 0.4 mm. wide, the apex mostly 



