62 CONTRIBUTIONS TO THE BRYOLOGY 



5. MARCHANTIA DISJUNCTA, Sulliv. Muse. Alleghan. n. 286. 



M. dioica ; receptaculo foemineo excentrico subseptem-radiato, 

 radiis apice cuneato-dilatatis emarginato-crenulatis subtus dense 

 barbatis; involucro 1 -3-carpo subintegerrimo ; receptaculo masculo 

 semicirculari 7-iadiato, radiis usque ad brevem pedunculum dis- 

 cretis ; fronde dichotoma et articulatim innovante : caetera 31. pobj- 

 morphce. 



This, the second species of the genus known to the flora of the 

 United States, differs strikingly from all others in its male re- 

 ceptacle. It has nowhere been found except on the high banks of 

 the Alabama river, near the town of Claiborne, where I met with it 

 in May, 1845. 



Tab. III. — Fig. 1. Female plant, natural size. Fig. 2. Male plant, nat- 

 ural size. Fig. 3. Male receptacle, with a portion of the frond. Fig. 4. 

 Transverse section of a ray of the male receptacle. Fig. 5. A gemmiferous 

 cup. Fig. 6. Portion from the margin of the same. Fig. 7. GemniE. 

 Fig. 8. Female receptacles. Fig. 9. Perpendicular sections of the same. 

 Fig. 10. Perianth and calyptra. Fig. II. A young pistil. Fig. 12. Chaffy 

 scales of the receptacle. Fig. 13. Transverse section of the peduncle. 

 Fig. 14. Spores and an elater. Fig. 15. Portion of a radicle. All the 

 analyses are more or less magnified. 



6. ANEURA SESSILIS, Muse. Alleghan. n. 280. 



Jungermannia sessilis, Spreng. — Lelm. Pugill. 4, p. 34. — Hook. £/■ Wils. in 

 Drumm. Muse. Amer. n. 174. 



The notices heretofore taken of this species appear to have been 

 drawn from imperfect specimens of the female plant. Aneura ses- 



