25 



3- Leucobryum antillarum Sch. 



Costa Rica: Coliblanco, 227a, Maxon, 1906. 

 4. Syrrhopodon incompletus Schwgr. 



Syrrhopodon Hobsoni Hook. & Grev. 

 Syrrhopodon decolorans C. Miill. 

 Syrrhopodon Mohrianum C. Miill. 

 Syrrhopodon Sartori C. Miill. 

 Mexico: Liebman, Sartorius, etc. 



Guatemala: Bernouille and Cario, Rio PoUochico, 3087, Maxon 

 and Hay, 1904. 



Honduras: Rio Platano, 690, Wilson,. 1903. 



5. Hyophila reflexifolia C. Miill. 



Guatemala: Alta Verapaz, 411, Cook and Griggs, 1902. 



6. Macromitrium Tonduzii Ren. and Card. 

 Costa Rica: La Palma, 481, Maxon, 1906. 



7. Macromitrium palmense R. S. Williams sp. nov. 

 Pseudoautoicous : growing in deep tufts, the primary stems 



creeping, bare, the secondary erect, branching, without radicles, 

 5 or 6 cm. high; leaves densely imbricate, spreading, crispate in 

 upper part; stem leaves 5 mm, long, linear-lanceolate, carinate, 

 serrulate about one half down, smooth throughout or with a few 

 low papillae on upper surface toward the base; excurrent costa 

 slightly denticulate; leaf cells below long and narrow, the median 

 in rows, about 6n wide by 10 to 12^ long, with furrows between, 

 or sometimes scarcely elongate in less distinct rows, the upper 

 elongate, not in rows; perichaetial leaves a little shorter than 

 stem leaves with longer cells above and more abruptly narrowed 

 to the denticulate, excurrent costa; seta smooth, 1.5 to 2.5 cm. 

 high; capsule smooth or nearly so, globose-pyriform, about 1.5 

 mm. high with stomata in several rows near base; lid not seen; 

 peristome double, the outer of reddish-brown, densely papillose 

 teeth, divided scarcely one half down, the inner of about the' 

 same height, a little paler, more or less irregularly divided; 

 calyptra without hairs, slightly rough at apex; spores slightly 

 rough, up to 35/x in diameter. 



In habit much like M. subcirrhosum but with median leaf cells 

 very different, leaf base scarcely papillose and costa distinctly 

 excurrent. 



Habitat: On tree trunk on open moist slopes. 



Type locality: La Palma, Costa Rica, 480, Maxon, May 6, 

 1906. 



