500 SEMATOPHYLLACEAE. 



longer, up to 1.32 mm., erect and clasping, more acuminate, entire or finely 

 subserrulate, ecostate with larger basal cells. Autoicous. Pedicel short, only 

 5 mm. ; capsTile l-l.o mm., erect or slightly inclined ; neck distinct ; lid with a 

 long beak equalling the urn; peristome short and teeth yellow, with deep basal 

 lamellae on the inside, dark basal segments, paler and papillose points; median 

 line not deeply grooved ; endostome with narrow pale papillose keeled segments, 

 which are not perforate, and the cilia often absent; spores smooth, ripe in 

 winter. .j 



On rotten wood and twigs in coppice, New Providence : — Florida ; Mississippi ; 

 Cuba; Jamaica; Hispaniola ; Porto Rico to Trinidad; Mexico to Brazil. Subpixnate 

 Sematophyllum. 



2. Sematophyllum admistum (Sull.) Mitt. Journ. Linn. Soe. 12: 485. 1869. 



Hypnum admistum Sull. Proc. Am. Acad. 5: 289. 1861. 



Plants small, yellowish-green, glossy. Stems short, creeping; branches 

 erect; leaves crowded, recurved at apex of stems and all more or less secund 

 when dry, spreading when moist, up to 1 mm. long by 0.3 mm. wide, concave 

 and acuminate with flat or slightly revolute, entire or sub-serrulate margins; 

 veins 2, short or none; cells eight times longer than wide, those of the basal 

 angles square wdth 2-3 alar cells enlarged and hyaline; perichaetial leaves 

 longer, up to 1.33 mm., more acuminate, entire, or subserrulate at apex. Autoi- 

 cous; pedicel bent at base, up to 7 mm. long; capsule 1-1.5 mm. long, hori- 

 zontal or curved, ovoid and contracted below the mouth when dry; calyptra 

 cucullate; lid pale, long-beaked; peristome double, its teeth with short projec- 

 tions on the outer surface and deep ones on the inner, paler and papillose at 

 apex; median line zigzag, not deeply grooved; endostome pale, with 1-2 cilia; 

 spores smooth, ripe in summer. 



Common, in dense cusliions on rotten wood in coppices, also on palmettov New 

 Providence, Abaco, Andros, Great Bahama and Watling's Island : — ^Plorida ; Cuba ; 

 Jamaica ; Porto Rico ; Virgin Islands to Brazil. Shining Sematophyllum. 



3. Sematophyllum sericifolium Mitt. Journ. Linn. Soc. 12: 483. 1869. 



Plants in thin glossy patches on rotten wood. Stems short and slender; 

 branches erect; leaves crowded, not secund, spreading when moist, up to 1 mm. 

 long and only 0.2 mm. wide at base, sharply pointed and mucronate, with in- 

 rolled entire margins, and large curved inflated alar cells; ecostate; the cells 

 linear, about 10 times longer than wide; perichaetial leaves shorter, up to 0.85 

 mm. long, clearly serrate and sometimes suddenly subulate and coarsely toothed 

 at the shoulder. Autoicous; pedicel short, only 5-8 mm. long, slender, curved; 

 capsule erect or slightly inclined, ovoid; lid with a long slender beak; calyptra 

 covering only the beak; walls of collenchyma cells; mouth bordered by red 

 cells; peristome double, the teeth with a deep outer median groove, yellow and 

 striate, paler and papillose at apex, within with deep lamellae extending almost 

 to the apex; endostome papillose with 2 slender eilja; spores rough, small, ripe 

 in spring. 



A few plants were collected at Nicholl's Town, Andros, by J. I. and A. R. Nor- 

 throp in 1890 : — Cuba ; Jamaica ; Hispaniola ; Porto Rico ; Virgin Islands to Grenada. 

 Glossy Sematophyllum. 



Class 2. HEPATIOAE. 



Liverworts. 



Contributed by Professor Alexander W. Evans. 



Terrestrial, epiphytic, or rarely aquatic plants, showing a dis- 

 tinct alternation of generations, the gametophyte existing as an in- 



