886 Transactions. — Botany, 



of about 4,000 feet. It belongs to the genus Thysanothecium of wbich there 

 were only two species previously known, both of which were found in 

 Western Australia by Mr. Drummond, the Colonial Botanist. It is worthy 

 of notice that the New Zealand plant was gathered on a glacier, while those 

 in Western Australia grew on burnt-up timber. As these Lichens are exceed- 

 ingly interesting to botanists I have made drawings and drawn up descrip- 

 tion form Mr. Buchanan's specimen, and have named it Thysanothecium 

 Buchanani in recognition of that botanist's valuable contributions to the 

 botany of the Southern Alps. 



Thysanothecium buchanani, sp. n. 



Thallus in duabus partibus formatus. 1° Pars horizontalis lobulato- 

 squamulosa e viride lurida, squamulis in crusta granulosa areolata con- 

 gestis. 2° Podetia erecta brevia in apothecia foliacea dilatata (alt. circa 

 6 mm.). 



Apothecia sciphi compressi instar plicata, nonnihil in limbum planum 

 producta, rigida apice inflexa et granulosa, disco testaceo-rufescenti recepta- 

 culum thallinum reticulatum omnino tegenti ; hymenium incolor excipulo 

 proprio luteolo strato gonimico imposito enatum, paraphysibus rectis capil- 

 laribus septatis adglutinatis apice non dUatis. Spor® Snae una serie dispo- 

 sitse sphericfe incolores diam. -013 mm. 



Corticale receptaculi stratum ex elementis filamentosis directis ad 

 laterem constitutum. 



Supra molem nivium frigoribus conglaciatam in summis montibus 

 (" Aspiring Eange "), alt. 4,000 pedes. 



EXPLANATION OF PLATE XVU. 

 Fig. 1. Spores and Paraphyses X 470. 



2. Gonidium X 470. 



3. Foliaceus apothecium — Hymenium within the pseudoscyphus, X 2. 



4. Longitudional section of apothecium, showing hymenium (a) ; proper 

 excipulum (hypothecium) [h) ; white medullary layer with gonidia (c) ; 

 colomiess corticular layer (d), X 30. 



