Lichenes.~] 



FLORA OP NEW ZEALAND. 



303 



Gen. XVIII. LECANACTIS, Eschw., Fries. 



1. Lecanactis impolila, Pries, Lick Eur. p. 377. Parmelia impolita, ejus A. p. 183. Arthonia bifor- 

 mis, Schar.l Exs. n. 251. 



Hab. Northern Island, Colenso. 



A very difficult species, for which the reader is referred to Fries. We are not fully prepared, however, to 

 assent to his arrangement of the synonyms. Mr. Colenso's specimen agrees with Schserer's published specimen 

 exactly. The geographical range of the present Lichen is probably very extensive ; it occurs all over Europe, in 

 the regions of the plains, according to Fries, and is included in Tuckermann's < Synopsis of North American 

 Lichens.' 



Gen. XIX. STIGMATLDIUM, Meyer. 



1. Stigmatidium crassum, Dab., Bot. Gall. p. 643. Moug. el Nest..' Exs. n. 955. Sagedia aggre- 

 gata, Fries, Licit. Eur. p. 416. cum syn. Opeographa crassa, /3 venosa, Schcer.! Exs. n. 587. 

 Hab. Northern Island, Colenso. 



We cannot but agree with our learned friends, Dr. Nylauder and Mr. Leighton, in referring this plant to the 

 Qraphidem. This plant has hitherto, we believe, been found only in Western Europe. 



p. 55. t. 14. f. 5. Peziza pruinata, 



Gen. XX. ARTHONIA, Ach. 



This is one of the most unsatisfactory genera of Lichens ; imperfect specimens of Graphis or Opegrapha assume 

 arthonioid forms, and it is a question not yet decided whether any Arthonim are autonomous species : they produce, 

 however, perfect sporidia. 



1. Arthonia pofo/morpha, Ach., Syn. Lick. p. 7. Eschw. in Mart. Ic. Sel. Crypt. Eras. p. 14. t. 9. 

 /8. 



Hab. Northern Island, on bark, Colenso. 



2. Arthonia? confluens, Fee, Ess. sur les Crypt, dies Ee. 

 Schweinitz ! Fries, Syst. Myc. 



Hab. Northern Island, on bark, Colenso. 



I am indebted to my valued friend Dr. Montague for determining this pretty species ; the description and 

 figure of M. Fee (fig. b.) accord tolerably well. The crust is rather thick, chalk-white, well defined, with a faint lilac 

 tinge here and there, somewhat pulverulent. In the New Zealand specimens the surface is completely studded over 

 with roundish minute apothecia, whose edges curve inwardly when dry, so as to resemble in some degree a Verru- 

 caria, opening irregularly by a pore ; when moistened they expand, and show a dark disc ; they are covered more 

 or less completely with glaucous pruina, and the general appearance of the plant reminds us more of Pyrenotliea 

 leucocepMla, Fries, than of any European Lichen which we can call to mind. I am tolerably confident that the 

 Peziza pruinata of Schweinitz (for a specimen of which I am indebted to Mr. Berkeley) belongs to this plant*. 



* Since the above was written, I have received the following communication from the Eev. M. J. Berkeley : — ■ 

 " I have compared your Arthonia confluens with the plant of Schweinitz to which you allude, and find no difference 

 microscopically or externally, except that yours is a little larger. It may possibly be the plant of Fee ; whether so 

 or not, it is impossible to say without a specimen ; but if so, Fee's is no Arthonia, but congeneric with Schweinitz's. 

 The Fungi are printed, or I should have had no hesitation in entering it amongst them as a mere form of Peziza 

 pruinata. Peziza conspersa, Pers., seems to be something of the same kind." 



