Ucpiiticd' of Nortli AiiK'ricd. '58 



1. M polymorpha L. Thallus usually 5 — 12.5 cm. 

 1()U«;\ 1.8 — 8.8 cm. wide, canaliculate, and with numerous small 

 pores above, plicate-venulose; carpocephalum deeply divided 

 into usually •> terete rays; peduncles 2.5 — 7.5 cm. high, stout, 

 pilose; involucres many-fruited; andrcficium on a naked pedun- 

 cle 2.5 cm. high or less, crenately or often palmately 2-8-lohed, 

 the lobes flat. 



//«?).— Ditches and wet places ; common. (Eu.) 

 Blb.—Syu. Hep. p. 522, 789; Hep. Europ. p. 150. 

 Delin.—Su\\i\. Mosses U. S. t. VI. 

 Exsic. — Hep. Bor.-Amer. No. 127. 



2. M. disjuncta Sulliv. Thallus 2.5 — 5 cm. long, 0.6 — 

 1.3 cm. wide, innovating from the apex; carpocephalum I cir- 

 cular, radiately 8-7-lobed, the lobes flat, cuneate, crenulate on 

 the outer margin; peduncles 2.5 cm. high: andrrecium large, 

 on a stout peduncle 2 — 4 mm. high, digitately parted, the divi- 

 sions elongate-oblong or linear-oblong, subentire. 



Hah. — Springy places, banks of Alabama R. near Clairborne {Snlli- 

 vant) . 



Bib. — Mem. Amer. Acad. n. ser. Ill, p. 63. 



Dfiin. — Mem. Amer. Acad. n. ser. Ill, t. III. 



Exsic— yiusc. Alleghan. Xo. 286; Hep. Bor.-Amer. No. 138. 



II. PREISSIA Nees. 



Carpocephalum hemispheric, 1-4-lobed, with as many rib- 

 like rays alternating with and shorter than the lobes, fibrous- 

 barbulate underneath. Outer invohicres as many as the rays, 

 attached to the under side of the lobes, 1-3-fruited, opening 

 beneath and outwardly by an irregular line. Inner involucre 

 obconic-carapanulate. angular, unequally -4-5-lobed. Calyptra 

 persistent, rupturing obliquely at the apex. Capsule large, dis- 

 tinctly pedicelled, dehiscing by 4-8 revolute segments. Spores 

 grossly tuberculate. Elaters short, bispiral. Inflorescence 

 dioecious or monoecious. Thallus obcordate, sparingly forked, 

 increasing by joints from the apex; pores conspicuous. Gem- 

 nia3 wanting:. Named for L. Preiss, a German botanist, 



