io6 The Scottish Naturalist. 



MacOwan), is allied rather to U longissima than to any of the 

 other groups. 



Usnea amplissima sp. nov. — Thallus robustus ramosus, divari- 

 cato-fibrillosus, pendulus, elongatus (longit. 1-4-pedalis) ; 

 axis centralis crassus, extus et, hinc hide, intus I niger vel 

 nigro-violaceus (reactione sub lente visa) ; apothecia magna 

 (latit. 10-30 mm.), fibrilloso-ciliata. Thallus extus K — C 

 pallide fl. 



The primary and secondary stems are rough, but scarcely 

 papillose, and frequently articulated, but not constricted as in 

 U. articulata. The main stem is often 2 mm. thick. 



Section III. 



With the thallus, as to branching and articulation, entirely 

 that of U. articulata. In about a half of the specimens at 

 hand, I gives on the surface of the filiform axis and fibrillar 

 more immediately in contact with it a vinoso-violaceous reaction ; 

 but as it is not always seen on even the same specimen, I have 

 not taken account of this reaction at present. 



1. V snea flexilis sp. nov. — Thallus flavescens vel rufo flavescens ; 



fibrillar medullares K fl. dein rufo-ferruginese vel rubentes. 



Neilgherries (Dr G. Watt), Africa Austral. (Dr J. Shaw); Fer- 

 nando Po (G. Thomson). 



2. Usnea subflexilis sp. nov. — Thallus pallide flavescens; hbriike 



medullares K flaventes. 



In Himalaya (J. Thomson). 



3. Usnea oncodes sp. nov. — Thallus lutescens vel lutescenti- 



cervinus, rigidiusculus, crassiusculus, erectus, ramosus, 

 ramis et ramulis prominule et creberriter caesio-sorediosis ; 

 axis centralis filiformis ; fibrillse medullares K fl. dein fer- 

 rugineo-rubentes, I vinoso-violaceae. 



In N. Z. (J. Buchanan). 



The thallus has the smooth aspect of U. articulata, and is also 

 inflated, &c. There is another under this section from South 

 Africa, gathered by Mr J. H. M'Lea. The thallus is, however, 

 not smooth and glistening, but opaque, minutely papillose, and 

 even slightly rugose. 



