The Genus Riccardia in Chile. 113 



t. Thallus with a prostrate axis and ascending to suberect 

 branches ; thallus destitute of specialized cells containing 

 fungus hyphae 20. R. nudimitra (p. 177). 



u. Thallus plane or nearly so on the upper surface 



23. R. pallidevirens (p. 189). 



u. Thallus with more or less involute margins, the upper surface 

 thus becoming concave to canaliculate v. 



V. Thallus covered over, especially on the ventral surface, with 

 crowded tooth-like or band-like outgrowths, representing 

 thickenings of the cell wall 24. R. granulata (p. 192). 



V. Thallus smooth 25. R. crassicrispa (p. 194). 



IV. Latent branch-rudiments in the form of simple lobe-like pro- 

 jections, with the apical cell in the axil 



22. R. tcnax (p. 186). 



zv. Latent branch-rudiments in the form of low, bilobed projec- 

 tions, with the apical cell in the indentation between the 

 lobes .r. 



X. Axis covered by a layer of cells about 14 ju, wide, a gradual 

 increase in width to the interior cells 30-45 ix wide being 

 observable 18. R. Negeri (p. i'/2). 



X. Axis covered by a layer of cells about 32 /x wide, an abrupt 

 increase in width to the interior cells 75 ju wide being observ- 

 able 21. R. floribunda (p. 182). 



I. Riccardia fuegiensis Massal. 



Riccardia fuegiensis Massal. Nuovo Gior. Bot. Ital. 17 : 255. 



pi. 26, f. 34. 1885. 

 Pseiidoneura fuegiensis Schififn. & Gottsche in Schififner, V., 



Forschungsreise "Gazelle" 4*: 40. pi. 8, f. /-p. 1890. 

 Pseiidoneura lincolata Gottsche, /. c. (as synonym). 

 Aneiira fuegiensis Evans, Contr. U. S. Nat. Herb, i : 142. 1892. 



Specimens examined : on humus, southern part of Smith 

 Sound, near the entrance to the Straits of Magellan, 1883, Gortner 

 (Y, specimen received from the Warnstorf Herbarium) ; without 

 definite locality. Southern Patagonia, Voyage of the "Albatross" 

 (U. S., listed by the writer as Aneura fuegiensis, 8, p. 142) ; 

 Lapotaia, 1896-97, Hatcher (Y., listed by the writer as A. fuegien- 



