176 BRYOLOGY AND HEPATICOLOGY OF NORTH AMERICA. 



atrata, Liebmanniana, &c. It is easily distinguishable from them, however, by the amphi- 

 gastrial laciniae and lobule of its involucre, which are long uncinate and ciliate-dentate 

 at the base. 



11. RICCIA LUTESCENS, Sckiveinitz ! Fronde viridi-lutescente cavernosa stellatim ex- 

 pansa unciali et majore plus minus dissecta, laciniis subtrichotomis linearibus 1-2 

 lineas latis canaliculatis subplanis subtus convexiusculis radiculosis margine subun- 

 dulatis apice dilatatis emarginato-bilobis supra turgidis subtus squamatis, squamis 

 transversalibus lunulato-ovatis teneris pellucidis albidis ; fructu ignoto. 



Schw. Hepat. Amer. p. 26, n. 2. No. 156, R. velutina, Hook. <J- Wils. ! in Drummond's Southern Mosses. Hook. 

 Icon. Plant, v. 3, t. 249 (excl. plant, fructif.). 



HAB. Moist ground and river-banks subject to inundations ; Ohio and Southern 

 States, frequent. No fruit has yet been found. The fruit figured in Hook. Icon. Plant. 

 1. c., Mr. Wilson informs me, belongs to R. crystallina. 



TAB. IV. A. Fig. 1. Plant, of the natural size. 2. A portion of the epidermis. 3. A cross section 

 of a plane part of the frond. 4, 5. Cross sections of the thickened end of the frond. 6. Longitudinal 

 section of the same. 7. Under side of the same, showing the scales. Magnified. 



