252 The Scottish Naturalist. 



Careful microscopic examination revealed nothing beyond the 

 structure of normal pores of Folyponis, ptychogastric threads, 

 and ochraceous spores. 



These questions meanwhile remain for solution : " What is the 

 nature of the structural transformation ? " or, if the result of para- 

 sitic work, " Of what nature is the parasite ? " One point only we 

 may regard as conclusively determined — viz., that Ptychogaster 

 must henceforth be deleted from the list of genera. 



ON OEETAIN LICHENS BELONGING TO THE GENUS 



PAEMELIA. 



{Continued from page 203.) 

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



Parmelia permiitata sp. nov. — Thallus pallidus vel pallide glau- 

 cescens, laevigatus, lobato-divisus, subtus niger, ambitu pal- 

 lide spadiceus, parce rhizinosus; medulla (parte supera) 

 alba (C leviter erythrinosa), parte infera leviter flavescente 

 (C flavente). Apothecia ignota. 



Ad ramulos prope Brisbane (F. M. Bailey). 



Par77ielia platycarpa sp. nov. — Thallus flavescens vel pallide 

 cervino - flavescens membranaceus, late expansus (K fl.) 

 nonnihil rugulosus vel passim laevigatus, lobato-laciniatus, 

 laciniis margine crenato-incisis vel ssepissime lacerato-dis- 

 sectis, subtus niger, partim nudus partim nigro-rhizinosus, 

 medulla alba (K flavente); apothecia magna (latit. 10-30 

 mm.) badio-rufa, receptaculo sessili vel soepius subpodicellato, 

 extus ruguloso vel foveolato-impresso : sporas Snae incolores, 

 episporio crasso, .03-.037 x .012-.02 mm.; paraphyses non 

 distinctae in gel. firma involutae. lodo gel. hym. co^rulescens. 

 Spermogonia extus nigra ; spermatia recta cylindrica, circ. 

 .006 X .0006 mm. 



Corticola prope Brisbane (F. M. Bailey). 



I consider this lichen distinct from P. latissima (Fee) in all its 



forms. 



Parmelia cyathina sp. nov. — Thallus pallidus vel pallide cinera- 

 scens, passim sordide glaucescens, lasvigatus, expansus, 

 lobato-laciniatus, laciniis crenato-incisis vel saspius lacerato 



