BBYOPHYTA. 17 



2a. Leaves without a ventral lob\ at base, often 3-5-tooJ 

 lob> 'ted, 



3a. Inner involucn present 



Lepidozia. Leaves and amphigastria 8-5-parted half way to 

 the base oy more. 



;5 1>. Inner involucn wanting, 



Calypogeia. Leaves entire or 2-toothed. Outer involucre 

 pendant. 



Trichocolea. Leaves cleft into main* capillar}' divisions. 

 Fructification in a fork, not pendant. 



•J I*. /.■ ' ■ - bilobi d or with a small ventral lobe at base. 

 4 a. Amphigastria wanting. Lower lobe usually convex 

 xuiderneath. 



Radula. Ventral lobe producing rootlets. 

 4 b. Amph igastria present. 



5 a. Amphigastria -i-o-lobed. Lobes of the leaves 

 divided, 



Blepharozia. Leaves palmatifid or complicate, 2-lobed, each 

 lobe divided and ciliate. 



5 b. Amphigastria entire or two-toothed. 



Madotheca. Lower lobe of leaf concave underneath. Inner 

 involnere with a small denticulate mouth. 



Frullania. Lower lobe of leaf auriculate. Inner involucre 

 with a mucronatc mouth. 



1 b. Vegetation thallose. 

 6 a. Jlidrib clearly apparent. 



7 a. Inner involucre wanting or early vanishing. 



Blasia. Outer involucre wanting. Fructification apical. 

 Thallus simple or bifid. 



7 b. Inner involucre tubular, at first terminal, at length 



dorsal. 



Steetzia. Thallus sinuate or lobed. 

 6 b. Midrib wanting or not apparent. 



