478 



INTRODUCTION TO CRYPTOGAMIC BOTANY. 



of Sphagnum, -with which genus it agrees in habitat. The 

 chlorophyll cells are not, however, superficial, but imbedded in> 

 the centre of the leaf. Cynodontium, which has the habit of 

 Weissia cirrhata, is almost intermediate between Weissiei and 

 Dicranei. Symhlepharis has the teeth approximated in pairs 

 and connivent above. The leaves are extremely crisped and 

 convolute. Dicranodontium is a Gam'pylopus destitute of the 

 fringe at the base of the calyptra. Bicnemon is perennial 

 and has the habit of Leucodon. It differs principally from 

 Dicraniim, in the branched creeping habit. Trematodon, 



Fig. 104. 



Tooth oi Dicranum scoparium, 

 mamified. Moug., No, 120. 



Fig. 105. 



Teetli of Trichost07num tortile. 

 magnified, Moug., No. 1012. 



as the name implies, is known by its perforated teeth. The 

 tribe includes many European species, some of which have a 

 wide distribution. Carai^ylopus fiexuosus, for instance, occurs 

 in New Zealand, India, Abyssinia, and South Africa, besides 

 Europe. Trematodon longicollis, agam, is found in New Zea- 

 land, South Africa, India, Java, Brazil, and Labrador. There 

 are many noble species peculiar to the southern hemisphere, 

 and some fine tropical forms. Some of these, however, as 

 Dicranum Siehierianum, occur in more temperate districts. 

 Leucohryum occurs in either hemisphere under the same 

 species ; but there are others which exclusively affect hot 



