CHILE/ N SPECIES OF METZGERIA. 285 



are said to average about 45 X 36 p. The Desolation Island speci- 

 mens are perhaps a trifle less robust than the type of M. decrescens 

 from the Ay sen Valley, and the branches tend to be shorter, but these 

 differences are too slight and too inconstant to be of much significance. 

 It is interesting to note that Dusen's material from Newton Island, 

 No. 113, has been differently determined by Stephani at different 

 times. The specimen in the Boissier Herbarium bears the name 

 M. terricola, while those at Stockholm and Upsala bear the name 

 M. Dvsenii. In the writer's opinion, as indicated above, these speci- 

 mens are clearly the same and represent M. decrescens. It might 

 appear from his determinations that Stephani recognized the identity 

 of his M. terricola and M. Dusenii and wished to supplant one name 

 by the other. Unfortunately this assumption is contradicted by his 

 published writings. 



3. Metzgeria corralensis Steph. 



Metzgeria corralensis Steph. Bull. Herb. Boissier 7: 933. 1899. 

 Metzgeria Lechleri Steph. op. cit. 942. 1899. 



Specimens examined: without definite locality or date, Gay (Mont., 

 as M. furcata, and listed under this name by Montagne, 14, p. 297); 

 Corral, no date, Krause (B., Type); Arique, no date, Lechler 652 (M., 

 unnamed but probably representing the type of M. Lechleri); Val- 

 divia, 1887-88, Hahn (B., as M. Liebmanniana and listed under this 

 name by Stephani, 19, p. 935) ; same locality, date and collector (B., 

 apparently a part of the same collection as the preceding but bearing 

 a manuscript name) ; Osarno Volcano, date and collector's name not 

 given (M.). 



Stephani places M. corralensis among the Pinnatae and describes 

 the thallus as remotely pinnate. At the same time he makes no allow- 

 ance for variability in the number of costal cells, as he did in M. 

 decrescens, stating definitely that the dorsal cortical cells are in four 

 rows and the ventral in eight. The type specimen shows that these 

 numbers are too rigid. Although the dorsal cortical cells are usually 

 in four rows (Fig. 3, A, B), the number really varies from two to five, 

 and the ventral rows are frequently fewer than eight (Fig. 3, B). In 

 spite of this variability a pinnate habit is no more apparent in M. 

 corralensis than in M. decrescens. 



The species varies in color from a pale yellowish green to a dull 

 green and is fairly robust. According to Stephani the thallus some- 

 times attains a length of 4 cm. The width is mostly 1-1.5 mm. but 



