156 MOSSES WITH A HAND-LENS 



5. Perianth conspicuous, split into 8 to 16 fringe-like lobes; peduncle 



not chaffy; plants with a noticeable odor Asterella. 



Perianth lacking; peduncle chaffy at top and bottom Grimaldia. 



(The Reboulia of this key is the Asterella of Gray's Manual and the 

 Asterella is the Fimbriaria of that work.) 



Figure 79. Marchantia polymorpha. i. Sterile thallus with gemmae. 2. 

 Male plant a little reduced, showing antheridial receptacles. 3. Longitudinal 

 section of antheridial receptacle magnified. 4. Female plant reduced showing 

 the stalked receptacles which characterize this family. These receptacles vary 

 in the family from the shape shown in this figure to almost perfectly conical 

 and entire. 5. Section of a part of a female receptacle magnified, showing 

 two sporogonia. The seta of one has elongated, pushing the capsule out 

 from the outer fringe (involucre) and the inner fringe (perianth). At the 

 base of the seta is a little collar representing the base of the broken 

 calyptra. (From Bryologist, 4:34-35, 1901.) 



CONOCEPHALUM AND MARCHANTIA. 



C. coNicuM (L.) Dura, and M. polymorpha L. are the 

 only two species of this family common enough to be often 

 collected by amateurs. They are both large, 2-5 inches or more 

 in length, grow on moist banks, and are somewhat similar in 



