172 A CONTRIBUTION TO, ETC. 



Lindsay : " This is one of the species possessing a distinct cor- 

 tical layer, composed of intimately united, polyhedral cellules, 

 while the medullary tissue resembles the filamentous texture of 

 the more gelatinous collemas. Its spores are ellipsoid, acum- 

 inate at the ends, having a delicate wall, and containing several 

 transverse rows of cellules, separated by indistinct, and some- 

 times unsymmetrical septa." 



(12) Pertusaria (from pertusus, full of holes or cracked in allu- 

 sion to the appearance of the fructiferous warts) is represented 

 here by one species P. communis, which frequently occurs on 

 trees and rocks. In this species, ^the spores are so large, that 

 under certain circumstances, they may be rendered visible to the 

 naked eye. When growing on trees, P. communis is of a grey- 

 ish white colour ; but on the rocks, owing probably to some 

 chemical action, it is somewhat yellowish. Oil the thallus of 

 this lichen, there is sometimes a very small one parasitical (Cali- 

 cium turlinatum). 



(13) Verrucaria epidermidis is also a very minute plant. The 

 name of the genus refers to the warted appearance of the species, 

 which arc scattered over the bark of trees like black or dark 

 coloured warts. I have not noticed any of the genus on rocks, but 

 in Europe, many such have been described. 



In addition to the species mentioned, I have also a specimen of 

 Sticta crocata in- my collection, but I have not mentioned it with 

 the others, as it does not occur anywhere near Parraniatta. From 

 the subjoined list, which I quote from the " Annual report of the 

 Government botanist, and the director of the Botanic Garden of 

 Melbourne for 1858," the reader will have an opportunity of as- 

 certaining the names of the species collected by Dr. F. Mueller 

 up to that period. 



LrCHENES, MlCHELI. 



Hamalina membranacea Cladonia 'vermicular is 



Sticta orygmwa C. ncglecta 



$. crocata Lecanora coarctata 



Parmelia perforcda Xi. parella 



P. caperata Gyropliora cj/lindrica 



P. conspersa Coccocarpia 1 ubiginosa 



P. enteromorpJta C leucorrliiza 



