ORTHOTRICHACEAE 117 



Seta about % ii^ch long; yellowish-brown. 



Capsule short, oval, erect; light brown; mature in sum- 

 mer. 



Operculum long-beaked. 



Range, Ontario and New England, south to Alabama and 

 Missouri; Asia. 



Drunimondia, when collected fruiting, will both inter- 

 est and puzzle the beginner, as the stems are creeping 

 and much branched, while the fruit is terminal. The 

 stems adhere so closely to the bark of the tree that it is 

 not easy to remove much of the specimen unless the 

 bark is cut. If only tufts of branches are removed, the 

 creeping stem is not noticed and the moss will most 

 likely be mistaken for Orthotrichum, the following 

 genus, as the leaves fold in much the same way. But 

 when long creeping stems covered with short erect 

 branches run out from the dense mats, the grow^th is 

 much like that of a pleurocarpous moss, except that 

 when the fruit is found it will be at the tips of the 

 branches. No pleurocarpous moss growing on trees has 

 such short thick branches, and the fruit is always 

 lateral. 



22. ORTHOTRICHUM Hedw. (Or-tho-tri-chum) 



A large and cosmopolitan genus occurring on trees 

 and on rocks. Several species are found in our range. 

 Name derived from two Greek words for '' upright " 

 and " hair," referring to the erect hairs on the cahptra. 



