414 HEPATIC^. 



Dimensions. — Fronds ^ to 2 inches long, J to |- inch broad, 

 cells "09 mm. x '045 mm., "09 mm. x '055 mm., 'll mm. x "05 mm., 

 '09 mm. x '05 mm. ; pedicel 1 to 2 inches long ; calyptra 3" mm. 

 high X r mm. broad; valves of capsule 175 mm. x 12 mm.; 

 elater-bearers 1* mm long x '025 mm. broad; elaters '5 mm. long; 

 spores '125 mm. x *1 ram. 



Hab. — Growing in large patches on banks and rocks in damp 

 or wet shady situations, in ditches or springy places. 



Common. 



1 to 18. I. 



Europe, North America. 



Obs. — A common species, which fruits plentifully in Spring. 

 It is distinguished when fertile from other frondose species by 

 its long delicate pedicel, which supports a rather large capsule, 

 containing an extraordinary number of spores and elaters; Herr 

 Jack has counted one containing no fewer than 4500 of the 

 former and 5000 of the latter. When sterile, the large, 

 submembranaceous, dark green, broadly nerved frond will 

 distinguish it. 



For the characters separating it from Pellia caJycina (Tayl.), 

 and Pellia Neesiana (G.), see notes under those species. 



Decriptions of Plate CXCVII. — Fig. 1. Fertile plants, 

 natural size (Ekart, after Hooker). 2. Young fertile plant, 

 magnified (ditto). 3. Cross-section of the same, more higldy 

 magnified (ditto). 4. Portion of frond x 290(Llanfaelog, W. H. P.). 

 5. Capsule magnified (Ekart, after Hooker). 6. Opened capsule, 

 showing elater-bearers x 10 (Jack). 7. Elaters and spores x 

 75 (ditto). 8. Elater-bearers x 7b (ditto). 9. Elater x 316 

 (ditto). 



