The Scottish Naturalist. i o 



6 



2. Usnea cornuta (Flot.) has the reactions of this section, so far, 



at least, as the specimens in my hb. warrant. Of these one 

 is from the south of England (Mr Holmes), two from Brit- 

 ish North America (Mrs Roy), another from the south of 

 Scotland (Mr J. M' Andrew), and one from the Brazils (Mr 

 Weir), more robust and laxer in habit, but still having the 

 characteristic arching and sorediiferous terminations to the 

 branches. 



3. Usnea radiata sp. nov. — Similis infra U. ccrat'uuc et papilloso- 



aspera sed supra ramosa ut in U. florida. Apothecia medi- 

 ocria vel magna (latit. usque ad 15 mm.) dense et longe 

 fibrilloso-ciliata (fibrillis validis et ramosis), subtus hinc inde 

 papilloso-aspera. 



Brasilia (Mr Weir). 



4. Usnea concinna sp. nov. — Similis U. ceratince, robusta (basi 



crassit-usque ad 2 mm.), erecta, rigida, ramosa, papilloso- 

 aspera (prsesertim supra); apothecia mediocria fibrilloso- 

 ciliata, subtus laevia (rarissime pauci- papillosa) ; sporae, 

 .01-. 012 x .006-. 0075 mm. 



In Brasilia (Mr Weir). 



5. I possess a specimen from the Himalayas gathered by Mr 



J. Thomson, which corresponds to the description given of 

 U. Himalayana (Bab.) by Nyl., Syn., p. 269, and which I 

 consider a good species. Its reactions are those of this 

 section. The soredia, which are thickly scattered over the 

 whole surface, communicate with the medullary fibres 

 through the external corneous layer, and are also often 

 tinged blue with Iodine. Dr Nylander's description is 

 far too meagre. 



Section II. 

 Fibrillar medullares K flaventes dein rubentes; I — 



1. Usnea perplexans sp. nov. — Similis U. floridce. 

 Pangi, Himalayas (Dr G. Watt). 



2. Usnea rubrotincta sp. nov. — Similis U. floridce sed thallo rubi- 



gineo et stipitibus hinc inde papilloso asperis. 

 Madeira (J. Payne). /CN^^T^ 



The branching upwards is entirely that of U. Jioridty\J~, ^^O^T/X^ 



f^ji •^•-^ V\ 



(. . ■ I IBftARY 



