JUNGERMANNIACE.E. (SCALE-MOSSES.) 707 



3. LEJEUNEA, Libert. (PI. 24.) 



Leaves decurrent at the folds, the lower lobe incurved and ventricose ; under- 

 leaves usually present, entire or bifid. Archegonium with a slender persistent 

 style, solitary on a usually very short braucb ; the perianth free from the invo- 

 lucral leaves, oval or oblong, terete or angular, variously carinate, cristate, or 

 ciliate. Capsule globose, 4-cleft to the middle, the valves recurved. Spores 

 large (40-50 yu broad), globose or oblong, tuberculate. Antheridia at the 

 base of ordinary leaves or in the axils of the leaves of a spike-like branch. 

 ( tlierwise as Frullania. (Named for A.-L.-S. Lejeune, a French botanist.) 



* Underleaves entire. 



1. L. clypeata, Sulliv. (PI. 24.) Stems procumbent, somewhat pin- 

 nately branched, f - 1' long; leaves whitish-green, round-ovate, cellular-crenu- 

 late, deflexed ; lower lobe flat, oblong-quadrate ; underleaves round-quadrate ; 

 monoecious; involucral leaves larger than those of the stem, the perianth 

 round-obovate, 2-3-carinate dorsally, 1-carinate ventrally, the keels rough. 

 (L. calyculata, Tayl.) On rocks and trees; common south and westward. 



* * Underleaves bijid ; haves entire. 



2. L. serpyllifolia, Libert, var. Americana, Lindb. Stems long, 

 somewhat branching, pale, pellucid and fragile ; leaves rather remote, flat, 

 opening from a basilar sac, scarcely decurved, obliquely roundish-ovate, ob- 

 tuse, often slightly repand ; underleaves about half as large, round-oval with 

 a broad obtuse sinus and acute lobes ; monoecious ; the obovate-clavate perianth 

 on a lateral branch. (L. cavifolia, Aitst.) On cedars, etc., Catskill Mts. 

 ( Cleve), Belleville, Out. (Macoun), and southward ; rather common. 



3. L. lucens,Tayl. Whitish, filiform, phmately branched ; leaves remote, 

 rarely subimbricate, obliquely ovate-triangular, rounded or obtuse, semi-cor- 

 date at base ; lower lobe ovoid, acute or apiculate ; uuderleaves as large as 

 the lateral, round-oval, deeply bifid, the lobes broad-subulate ; dioacious ; invo- 

 lucral leaves rather longer, with lanceolate lobes ; perianth scarcely emersed, 

 broadly pyriform, 5-carinate. (L. cucullata, Sulliv.; not Nees.) Near Cin- 

 cinnati; moist rocks, Alleghauy Mts. and southward (Sullivant). Minute 

 and flaccid. 



* * * Underleaves obsolete ; leaves muriculate-denticulate. 



4. L. calcarea, Libert. Very minute ; stems slender, loosely branch- 

 ing; leaves ovate, falcate-decurved, sinuate-complicate at base; monoecious; 

 iuvolucral leaves bifid, the divisions entire; perianth on a very short lateral 

 branch, pyriform-clavate, acutely 5-angled, the margin echinate-muriculate. 

 (L. echinata, Tayl.) On rocks and roots of trees; rather common. (Eu.) 



4. RAD IT LA, Dumort. (PI. 24.) 



Leaves large, complicate-bilobed, incubous ; lower lobe small, bearing root- 

 hairs ; underleaves none. Dioecious, rarely monoecious. Fruit usually ter- 

 minal. Involucral leaves 2, slightly smaller than the cauline, 2-lobed ; perianth 

 tubular, compressed or nearly terete, truncate, entire or crenate. Calyptra 

 pyriform, persistent. Capsule oval-cylindric. Elaters slender, free. Spores 

 large, globose, minutely tuberculate. Antheridia in the ventricose bases of 



