BBYOPHYTA. 11 



RICCIACE^E. (Cry>tal worts.) Plant-body a diehoto- 

 mously branched thallus, usually Bcaly beneath. Capsule im- 

 mersed in the thallus or sessile on its surface, indehiscent ; 

 columella wanting. (See page 18.) 



BRYACE^E. Genera: 



1 a. Fruit acrocarpous, 

 2 a. Mouth of the capsule naked, 

 3a. Lid broadly convex, not beaked. 



Hedwigia. Stem forking, radiculose at base. Leaves 

 8-ranked. opaque. Capsule short-stalked, immersed in the 

 perichstium, globose. Calyptra minute, barely covering the 

 lid, fugacious. 



3 b. Lid icith a long straight beak, 



Physcomitrium. Plants simple or sparingly branched at 

 the base by innovations. Capsule globose or turbinate, stalked, 

 immersed, or exserted. Calyptra 5-lobed at base, descending 

 to middle of capsule, not hairy. 



2 b. Mouth of the capsule with teeth. 

 4 a. Peristome single. 

 5 a. Teeth 4. 



Tetraphis. Stems a third or more as long as the fruit-stalks. 

 Calyptra conical mitrate, covering the capsule to the middle. 



5b, Teeth S or IQ. 

 G a. Calyptra m itriform. 

 7 a. Calyptra plicate. 



Orthotrichum. Plants pulvinate, rooting at base in the 

 axils of branches. Leaves hyaline in the lower part. Capsule 

 mostly immersed and 8 — 1G striate when dry, often twisted. 

 Calyptra campanulate. often hairy. Teeth 8 or 16. 

 7 b. Calyptra not plicate. 



Grimmia. Plants more or less compactly cespitose or pulvi- 

 nate. radiculose only at the base. Stem repeatedly forking. 

 Leaves opaque, close, open, rarely secuud, lanceolate, margin 



