CHILEAN SPECIES OF METZGERIA. 275 



original material of Jungcrmannia dichotoma from the Swartz collec- 

 tions; the others came from Guadeloupe, St. Vincent, Mexico, Brazil 

 and Peru. The Jamaican specimens were the only ones that included 

 plants of the true M. dichotoma, as this species is now understood, and 

 two of these contained an admixture of M. hamata; the eight remain- 

 ing specimens represented seven distinct species, three of which were 

 at that time undescribed. In the Stephani Herbarium, now at 

 Geneva, Schiffner found eight specimens bearing the name M. dicho- 

 toma, all of which had been collected in Brazil. Not one of these 

 represented the true M. dichotoma. They represented instead three 

 distinct species, not duplicated in the Lindenberg Herbarium. These 

 two authoritative herbaria, therefore, which have served as the basis 

 for many printed records, contained ten different species that had 

 been incorrectly determined as M. dichotoma. 



In view of these facts the writer has made an attempt to obtain 

 for examination a full series of Chilean Mctzgcriae and especially of 

 specimens upon which printed reports have been based. This has 

 been made possible through the kindness of correspondents and the 

 curators of herbaria, and the writer would express his sincere thanks 

 to all who have assisted him in his work. As a result of this study 

 seven of the species based on Chilean material are reduced to synon- 

 ymy, two species are proposed as new, and several incorrect determina- 

 tions are rectified. These various changes reduce the number of 

 known species to eleven, although certain fragmentary and undetermi- 

 nable specimens indicate that this number is too low. In the cita- 

 tion of specimens the following abbreviations are used: B, Stephani 

 collection in the Boissier Herbarium, University of Geneva; H, Cryp- 

 togamic Herbarium of Harvard University; M., Mitten Herbarium, 

 at the New York Botanical Garden; Massal., collection of Professor 

 Massalongo at Verona; Moll., collection of Dr. Moller at Stockholm; 

 N. Y., herbarium of the New York Botanical Garden; S., collection 

 of Professor Schiffner at Vienna; St., herbarium of the Swedish 

 National Museum at Stockholm; U., herbarium of the University of 

 Upsala; Y, herbarium of Yale University (including the private 

 collection of the writer). 



Key to the Species. 



a. Upper surface of thallus densely covered with hairs 



1. M. frontipilis (p. 276). 



a. Upper surface of thallus naked b. 



b. Costa bounded dorsally, on robust thalli, by more than two 



rows of cortical cells c. 



b. Costa bounded dorsally by only two rows of cortical cells d. 



