14° Alexander W. Evans, 



misleading in one or two respects. According to his statements the 

 main axis is winged by two rows of large cells, and these are 

 clearly shown in his figure, which represents the transverse sec- 

 tion of a primary branch. He makes no mention, however, of a 

 small-celled superficial layer covering over the large cells com- 

 pletely, and this layer is not indicated in any way in his drawing. 

 The type specimen of A. spiniloba shows this layer clearly and also 

 the median band of narrow cells on the lower surface, agreeing in 

 both these respects with the type of R. Spegazzimana. This 

 ventral band of narrow cells deserves special mention. The cells 

 project a trifle and give the surface a slightly velvety appearance. 

 Since they are considerably thicker than wide, they look as if they 

 might have some secretive function. The band varies in width 

 according to the width of the axis or branch upon which it is 

 situated, but it persists (as already pointed out) even on terete 

 branches. 



8. Riccardia spectabilis (Steph.) comb. nov. 

 Aneura spectabilis Steph. Bull. Herb. Boissier 7 : 746. 1899. 



Specimens examined : Puerto Angosto, Desolation Island, 

 1896, Dusen 166 (U., listed by Stephani as A. spectabilis, 29, p. 

 9); Rio Azopardo, Tierra del Fuego, 1896, Dusen J5 (N. Y., 

 listed by Stephani as A. spectabilis, 29, p. 9) ; without definite 

 locality, Tierra del Fuego, 1896-97, Hatcher (Y., listed by the 

 writer as A. calva, 9, p. 410, and 10, p. 38) ; Port Gallant, 

 Cunningham- (M.). 



The species has likewise been reported from the following 

 localities, under the name Aneura spectabilis: Rio Grande, Tierra 

 del Fuego, Dusen (29, p. 9) ; Clarence Island, Racovitza lySc (30, 

 p. 3) ; Lake Fagnano, Skottsberg (32, p. 9). 



Although R. spectabilis is usually less robust and paler than R. 

 Spegazziniajia, the two species are closely related, and the following 

 description will bring out many points in common. According 

 to Stephani R. spectabilis is procumbent or erect among mosses, but 

 the scanty material studied by the writer hardly shows what 

 the habit really is. The plants are pale brown, becoming darker 

 with age, but never showing the almost black hue characteristic of 

 R. Spegazziniana. In a few cases rhizoids were observed and were 

 quite indefinite in their position. 



