'38 CONNECTICUT GEOL. AND NAT. HIST, SURVEY. [Bllll. 



The genera, where represented by more than a single 

 species, are suppHed with artificial keys to the species, and the 

 orders or families are supplied with similar keys to the genera. 

 The arrangement followed is in most respects like that given 

 in Engler & Prantl's " Die naturlichen Pflanzenfamilien." 

 Since, however, the treatment of the Bryales in this work is 

 still incomplete, the hypnoid Mosses are largely arranged ac- 

 cording to Warnstorf in the second volume of the " Kryptoga- 

 menflora der Mark Brandenburg." Warnstorf is also followed 

 in the position of the Polytrichacese and allied families. These 

 apparently represent the most highly developed members of 

 the Bryophytes, and it is therefore most logical to place them 

 at the conclusion of the series. 



[Subclass Hepaticae] 

 ORDER MARCHANTIALES 



FAMILY RICCIACE^ 



1. Terrestrial; green cells in rows at right angles to the 



upper surface of the thallus, enclosing air spaces in the 

 form of narrow canals; epidermis without pores. .. .Riccia 

 Terrestrial or aquatic; green cells in layers one cell thick, 

 separating the irregular air spaces from one another. . 2 



2. Epidermis without pores, sometimes becoming irregularly 



ruptured with age Ricciella 



Epidermis with distinct pores, not becoming ruptured with 

 age Ricciocarpus 



U-|aaAx.<». iiRiccia (Mich.) L. 

 Riccia [arvensis Austl ^r«. '75"- 7 :r*w ('-**--'*-*»• ^t-) 



Cultivated fields and margins of ponds. Autumn. Hart- 

 ford: Hartford, Harger. New Haven: Orange (1892), 

 Evans. Middlesex: Middlefield, Evans. 



Ontario to Maryland. 



Exsic. Miss Haynes, Amer. Hep. No. 2. 



Ref. Evans, 28, 170. Underwood, 74, 278: 76, 4. 



Ricciella A. Br. (^ *^^. ^ d.'\'^.j 



I. Capsules rupturing on the upper surface of tlie thallus; 

 epidermis soon breaking down and leaving the sponge- 

 like green tissue exposed. .^Wr^^ J ^.^^. . .R. crystallina 

 Capsules rupturing on the lower "surface ^'oT the thallus 2 



