PHYTOLOGY. 



ON OEETAIN LICHENS BELONGIM TO THE GENUS 



PAEMELIA. 



By JAMES STIRTON, M.D., F.L.S. 



( Continued fro7n page 254. ) 



Parmelia reddenda sp. nov. — Similis P. ^^rrm sed medulla (C — 

 vel K — C — ). Thallus subtus niger ambitu spadiceus ru- 

 gosulus rhizinosiis, rhizinis nigris, nigricantibus vel etiam 



interdum pallidis. Sterilis. 



Prope New Galloway Scotiae, a J. M'Andrew lecta. 



This lichen resembles exactly specimens of P. Borreri (also 

 gathered from the same locality) both in colour and soredioid 

 points. It preserves the same characteristics whatever the stage 

 of growth. It must be closesly allied to P. ncgata (Nyl.), the 

 only recorded description of which is however very imperfect. 



Parmelia eimda sp. nov. — Thallus pallide glaucescens laciniato- 

 dissectus, laciniis inciso-divisis, plerumque margine recurvis 

 et hinc inde nigro-ciliatis, subtus niger, nudus, rugosulus 

 ambitu spadiceus vel fuscescens et saepe dealbatus ; medulla 

 alba (K — C bene erythrinosa sed C seorsum, erythrinosa 

 saltem leviter) ; apothecia mediocria vel majuscula recepta- 

 culo subpedicellato vel elevato ; sporje Snae, .02-.028 x 

 .011-.016 mm. lodo gel. hym. vix tincta, thecce coerule- 

 scentes, dein sa^pe fulvescentes. Spermatia cylindrica recta, 

 .01 -.014 X circ. .0006 mm. 



Corticola ? prope Victoriam, in Africa merid., a eel. G. Thom- 

 son lecta. 



Parmelia resupiiia sp. nov. — Similis P. siihriigafa. (Nyl.) a ccl. 

 Krempelhiiber in ' Exot. Flecht.,' p. 320 descripta, sed 

 minor et thallus subtus niger rugosulus, raro nigro-rhizinosus 

 et ambitu saepe dealbatus ; apothecia mediocria receptaculo 



