724 JUNGERMANNIACE^E. ( SCALE-MOSSES.) 



five times as long as broad. (Steetzia Lyellii, Lchm.) Among mosses in 

 swamps and on dripping rocks; common, especially southward. (Eu.) 



30. B LAS I A, Micheli. (PI. 23.) 



Thallus simple or forked or stellate, with sinuous margins. Dioecious. 

 Fruit from an oval cavity in the costa. Involucre mostly none. Calyptra 

 obovate. Capsule oval-globose. Antheridia immersed iii the thallus, covered 

 with dentate scales. Gemmae globose, issuing by a slender ascending tube 

 from large flask-shaped receptacles which are immersed in the thallus. 

 (Named for Blasius Biagi, a monk of Valombrosa and companion of Micheli.) 



1. B. pusilla, L. Thallus -l|' long, 2-3" wide, narrowly obovate, 

 the margins piuuatifid-sinuous. Wet banks; common. (Eu.) 



31. PEL LI A, Raddi. (PI. 23.) 



Thallus with a broad indeterminate costa. Monoecious or dioscious. Fruc- 

 tification dorsal near the end of the thallus. Involucre short, cup-shaped, 

 lacerate-dentate. Calyptra membranous, oval, longer or shorter than the in- 

 volucre. Capsule globose. Elaters long, free. Aiitheridia globose, immersed 

 in the costa. (Named for A. L. Pelli, an Italian botanist.) 



* Monoecious. 



1. P. epiphylla, Raddi. (PI. 23.) Thallus oblong, lobed and sinuate, 

 somewhat fleshy, much thickened in the middle ; capsule exserted. On the 

 ground in wet places ; not uncommon eastward. (Eu.) 



* * Dioecious. 



2. P. endiviSBfdlia, Dumort. Thallus flat, green or purplish, broadly 

 linear, dichotomous, the margin mostly undulate or crisped. On the ground 

 and in ditches; common, but often confused with n. 1. (Eu.) 



3. P. calycina, Nees. Thallus dichotomous, proliferous, the early di- 

 visions linear-oblong, the margins ascending and remotely sinuate, the later 

 divisions linear-palmatifid, coarsely nerved ; cells large, hexagonal ; involucre 

 ciliate-f ringed or lacerate : calyptra smooth, included. Wet limestones and 

 shales. (Eu.) 



32. METZGERIA, Eaddi. (PL 23.) 



Thallus linear, dichotomous, with well defined costa. Dioacious. Fructifi- 

 cation arising from the under side of the costa. Involucre 1 -leaved, scale-like, 

 at length veutricose. Calyptra clavate or pyriform, fleshy. Capsule short- 

 pedicelled. Elaters unispiral, some remaining attached to the tips of the 

 valves. Spores minute, mostly smooth. Antheridia globose, enclosed in a 

 scale on the under surface of the costa. (Named for J. Metzfjer, a German 

 botanist.) 



* Densely villous throughout. 



1. M. pubeseens, Raddi. Thallus 1 -2' long, \" wide, alternately pin- 

 nate or somewhat decompound, the short linear branches of uniform width, 

 flat, the margin undulate ; hairs longer beneath, single or in twos and threes 

 near the margin, irregularly curved ; midrib nearly without cortical layer, 

 with 6-10 (mostly 8) rows of very uniform peripheral cells; dioecious. In 

 mountain regions, eastward. (Eu.) 





