PTEIIOGONIUM. 215 



Hypnums and NecJceras. MilUer^ it will be seen, now classes 



it with the latter. ISTame derived from its winged shoots or 



branches. The fruit of all the species is rarely produced. 



Generic Character. — Seta lateral. Peristome single, of sixteen 

 entire, equidistant teeth. Calyptra dimidiate. 



1. Pterogonium Smithii, Sw. [Curled Pterogojilum.) 

 Stems much branched; branches pinnate; leaves hgnlate, 

 obtuse, entire, crisped when dry, their margins recurved, 

 the nerve reaching about half-way up ; seta very short ; lid 

 rostrate. — Eng. FL p. G9. Neckera Smithii, Mull. Siju. 

 pt. 'I. p. 118. 



Trunks of trees in the south of England ; com.mou in 

 Devonsliire. Pr. (rare) Spring. This, as regards Britain, 

 is a strictly southern species, and is found on the Continent 

 only middle and south. It is a pretty species, and from its 

 convolute branches and crisped leaves has been likened to 

 a genus of Bridel's HelicopJi^llu)ii (Spiral-leaf). 



•2. PxEiiOGONiUM GRACiLE, Sw. {Slender Pte7-ogo7iium.) 

 Branches fascicled, curved; leaves broadly ovate, acute, 

 concave, their margins plane, the summits serrated faintly, 

 two-nerved at the base; lid conical. — Eng. Fl.p. 79 ; Mull. 

 Spi.pt. 2. p. 97. 



On rocks (rarely on the trunks of trees) in subalpine dis- 



