138 Alexander W. Evans, 



Aneura Spegazziniana Steph. Hedwigia 32: 138. 1893. 

 Aneura spiniloba Steph. Kungl. Svenska Vet.-Akad. Handl. 46*^ : 



9-f.i,g. 1911- 



Specimens examined: Staten Island, 1882, Spegazzini 

 (Massal., type, M.) ; Borja Bay, Straits of Magellan, Voyage of 

 the "Albatross" (U. S., Y., listed by the writer as Aneura miilti- 

 fida (?), 8, p. 141) ; without definite locality, Tierra del Fuego, 

 1896-97, Hatcher (Y., listed by the writer as A. Spegazziniana, 9, 

 410, and 10, p. 38) ; Skyring, Ensenada Rodriguez, southern 

 Patagonia, 1908, Halle & Skottsherg (U., type of Aneura 

 spiniloba). 



The species has been reported from the following additional 

 localities : Otway Bay and Desolation Island, Savatier, and Her- 

 mite Island, Hariot (2, p. 243) ; Desolation Island, Duscn (29, 

 p. 9, as Aneura Spegazziniana) ; Almirantazgo, Tierra del Fuego, 

 Skottsherg (32, p. 9, as A. Spegazziniana). 



In R. Spegazziniana a more or less regularly pinnate thallus, 

 showing a clear distinction between the axis and the branches, is 

 again observable. The plants are described as erect by Stephani, 

 and this is probably their natural position, but it would be difficult 

 to reach a definite conclusion on this point from the material at 

 hand. They apparently grow in loose tufts, with or without 

 admixture, and vary in color from pale to dark brown, becoming 

 almost black in the older parts. No rhizoids have been demon- 

 strated by the writer. 



The flattened main axis is rigid, becoming leathery when 

 moistened, and exhibits long-continued growth, reaching a length 

 of 13 cm., according to Stephani, but usually only 6-9 cm. long. 

 Its width usually varies from i mm. to 2 mm. but may be as much 

 as 3 mm. ; its thickness is usually only 0.5-0.6 mm. In cross sec- 

 tion (Fig. 3, C) the thallus shows a somewhat biconvex outline, 

 the ventral edge bulging less than the dorsal; the ends of the 

 section are obtuse or subacute. In the median part the axis is 

 mostly ten to twelve cells thick, and the thinning out toward the 

 sides is very gradual, no marginal wings being discernible. The 

 axis is bounded on the outside by a single layer of small cells with 

 slightly thickened walls. On the lower surface a broad median 

 band (not shown in the figure) can be distinguished, in which the 

 cells are about 28 /x long and only 16-20 /x wide; elsewhere the 



