38 CONNECTICUT GEOL. AND NAT, HIST. SURVEY. [Bull. 
The genera, where represented by more than a single 
species, are supplied 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 nattirlichen 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 Polytrichacez 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 Hepaticz] 
ORDER MARCHANTIALES 
FAMILY RICCIACE-F 
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 
Fuptuned “Witii As Ge 22. eae cosa aan amare ee nabs Be Be Ricciella 
Epidermis with distinct pores, not becoming ruptufed with 
BEC” vng.45 oueeys X Hew SEE tung Raeeaund aun Oe eae Ricciocarpus 
Riccia (Mich.) L. 
Riccia arvensis Aust. 
Cultivated fields and margins of ponds. Autumn. Hart- 
FORD: Tlartford, Harger. New Haven: Orange (1802), 
Evais. IwpLesex: Middlefield, Evans. 
Ontario to Maryland. 
Exsic. Miss Haynes, Amer. Hep. No. 2. 
Rer. Evans, 28, 170. Underwood, 74, 278: 76, 4. 
Ricciella A. Br. 
1. Capsules rupturing on the upper surface of the thallus; 
epidermis soon breaking down and leaving the sponge- 
like green tissue exposed..............0.000. R. crystallina 
Capsules rupturing on the lower surface of the thallus 2 
