^^^ LIST OF PLATES. 



Werssta curvzrostra.~Fig. 1, plants, nat. size ; 2, leaves, magni- 



hed; 3, capsule, with calyptra; 4, ditto, uncovered. 

 Wetssra calcarea.-Fig. 1, plants, nat. size; 2, ditto, magnified; 



3 leaves, magnified ; 4, calyptra, magnified ; 5, capsule. 

 Z^ffodon «,«oaW-Pig. 1, plants, nat. size ; 2, ditto, magnified ; 



6, leaf magnified ; 4, calyptra, magnified ; 5, mature capsule, 



magnified ; 6, peristome, magnified. 



Plate XX. Illustrative of the structure of Hepatic Mosses. 

 Fig. 1. Plant oi Jungermannia, nat. size. 



Fig. 2, Ditto, much magnified, showing at a, calyptra; b, elon- 

 gated receptacle; c, mature capsule, discharging spii-al fila- 

 ments and spores. 



Fig. 3. Antheridium iu axUs of leaves. 



Fig. 4. Ditto, detached. 



Fig. 5. Spiral filaments and spores, much ma<^nified 



Marchantia.---Fig. 1, plant, with pistiUidia, nat. size; 2, ditto, 

 with antheridia, nat. size; 3, portion of plant, much mag- 

 nified ; 4 separate involucra, with filaments and spores; 

 5, spiral filaments and spores, much magnified 



Lycopodium clavatum.-Y\g. 1, plant, nat. size; 2, capsule, with 

 projectmg scale, magnified ; 3, spores, much magnified 



