40 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



Litchfield: Salisbury, Mrs. Phelps. Hartford: New 

 Britain, Shepard. Fairfield : Fairfield and Stratford, Eames. 

 New Haven : East Haven, /. A. Allen; Milford, Eames; New 

 Haven (1875), Eaton; Oxford, Harger. Middlesex: Clinton, 

 Miss Marion Clark. |^^. 4<^ ■ "^^2. <^'^^- 



New England west to British Columbia and south to 

 Mexico; Brazil; Europe ; Asia ; Australia. 



Ref. Eaton 15, 68. Evans, 28, 170. 



FAMILY MARCHANTIACE^ 

 I Air chambers in several layers, separated from one another 



by plates of green cells 2 



Air chambers in a single layer, the green cells arranged in 

 simple or branched rows arising from the floors of the 

 chambers 4 



2. Sporophytes destitute of distinct pseudoperianths 3 



Sporophytes each surrounded by a distinct pseudoperianth, 



consisting of a thin membrane divided longitudinally ^-^ 



into eight segments Asterella "' '* 



3. Ventral scales of thallus purple, scarcely projecting 



beyond the margin; capsule only partially filling the 



involucral cavity Reboulia ^Jj 



Ventral scales of thallus soon becoming bleached, extend- 

 ing far beyond the margin, and usually forming a dense 

 tuft at the apex; capsule completely filling the involucral 

 cavity Grimaldia 



4. Pores in epidermis of thallus simple, each surrounded by 



a single layer of cells ; 5 



Pores in epidermis compound or barrel-shaped, each sur- 

 rounded by cells arranged in several tiers 6 



5. Outlines of air chambers distinct to the naked eye; gemmae 



none; plant native Conocephalum 



Outlines of air chambers indistinct to the naked eye; 

 gemmae abundant, produced in crescentic receptacles; 

 plant introduced into greenhouses Lunularia 



6. Gemmre none; carpocephala with indistinct flat rays Preissia 

 Gemmae usually abundant, produced in cup-shaped re- 

 ceptacles; carpocephala with distinct terete rays Marchantia Jj 



Reboulia Raddi 



Reboulia hemisphaerica (L.) Raddi. Asterella hemisphce- 

 rica Beauv. 



On shaded banks and in crevices of rocks. May and June. 



