276 EVANS. 



c. Ventral surface of wings naked, the ventral hairs (when 

 present) being restricted to the costa; gemmae lacking 



2. M. decrescens (p. 279). 



c. Ventral surface of thallus, including the wings, more or less 



densely covered with hairs ; gemmae dorsal. .3. M . corralensis (p. 285). 



d. Costa bounded ventrally by four rows of cortical cells; 



gemmae marginal e. 



d. Costa bounded ventrally by only two rows of cortical cells /. 



e. Marginal hairs often in divaricate pairs; ventral surface of 



wings usually with scattered hairs 4. M. divaricata (p. 288). 



e. Marginal hairs borne singly; ventral surface of wings naked. 



5. M. patagonica (p. 291). 

 /. Gemmae lacking g. 



f. Gemmae present, borne on more or less specialized branches 



becoming narrower toward the tips i. 



g. Thallus plane or nearly so; marginal hairs usually borne 



singly and sometimes scantily developed or lacking h. 



g. Thallus convex, the wings more or less revolute j. 



h. Autoicous 6. M. chilensis (p. 294). 



h. Dioicous 7. M. decipiens (p. 296). 



i. Plants not turning bluish when dried; thallus and gemmae 



plane or nearly so 8. M. epiphylla (p. 303). 



i. Plants turning bluish when dried; thallus and gemmae 



more or less convex 9. M. violacea (p. 306). 



j. Marginal hairs borne singly and often scantily developed. 



10. M. magellanica (p. 313). 

 j. Marginal hairs usually in pairs 11. M. hamata (p. 315). 



1. Metzgeria frontipilis Lindb. 



Metzgeria frontipilis Lindb. Acta Soc. F. et Fl. Fenn. I 2 : 14. pi. 1, f. 2. 1877. 

 Metzgeria brevialata Steph. Bihang K. Svenska Vet.-Akad. Handl. 26 3 

 (No. 6) : 20. 1900. 



Specimens examined: Newton Island, May, 1896, Dusen, mixed 

 with 113 (B., St., U., see 20, p. 19); San Pedro Island, Dusen 533 

 (Moll., type of M. brevialata); shores of Trinidad Canal, Coppinger 

 (M.) ; York Bay, September, 1853, Lechler 1354 (M., as M. pubcscens); 

 same locality, Lechler (N. Y., as M. pvbcseens var. subglabra); south- 

 ern part of Smith Sound, near the entrance to the Straits of Magellan, 

 1883, Gortner, mixed with Riccarclia fucgicnsis and other bryophytes 

 (Y., specimen received from the Warnstorf Herbarium); Puerto 

 Angosto, Desolation Island, March, 1896, Dusen, mixed with 159 

 (B., M., St., U., see 21, p. 10); Straits of Magellan, 1868, Dow (Y.); 

 Rio Azopardo, Tierra del Fuego, March, 1896, Dusen 72 (U., as M. 

 pubcscens, and listed under this name by Stephani, 21, p. 10); without 

 definite locality, Tierra del Fuego, 1896-97, Hatcher (Y., 3, p. 426); 

 Cape Horn, Hooker (M., 10, p. 15; listed as Jungermannia furcata /3. 



