418 DE LAUDER LINDSAY ON THE 



state (a). They have the general characters of the spores of Lecanora and Psoroma, 

 rather than of Pertusaria, especially as regards size. 



22. P.perrimosa, Nyl., Lick. N.Z., 253 (figs. 26, 27). 



On columnar basalt ; Greenisland Bluff. 



This is one of several local saxicolous Lichens, whose thallus is apt to occur 

 abundantly sterile, and isidioid or variolarioid (sorediiferous). The plant differs 

 greatly from the majority of our British types of Pertusaria, in the extreme 

 smallness of its thecae and spores. The paraphyses also are scarcely typical, in- 

 asmuch as they are colourless, delicate, and filiform, without coloured or clavate 

 heads; they are, nevertheless, sub-discrete, regularly arranged linearly, with 

 their apices readily seen (fig. 26 a). The thecce (fig. 26 b) are unaffected, more- 

 over, by iodine ; are 8-spored ; -0021" long, and -0003" to '0006'' broad, according 

 to age and maturity of contents. The spores (fig. 27) are simple, ellipsoid, colour- 

 less ; -0004" long, and -00015" broad. 



23. Pannaria immixta, Nyl., Lich. N.Z., 249 (fig. 28). 



On the branches of trees, East Taeri Bush. 



The thallus is sub-coralloid ; the paraphyses very delicate, filiform, indistinct, 

 without coloured, clavate heads ; the thecse indistinct, 8-spored ; the hymenial 

 gelatine pale blue with iodine. The spores (fig. 28) are ellipsoid, simple, colour- 

 less ; 0006" long, and -00025" broad. 



24. P. gymnocheila, Nyl., Lich. N.Z., 250 (fig. 29). 



On trees ; Martin's Bush, Chain Hills ; associated with Collema leucocarpum, 

 Tayl. 



The plant has a general resemblance to Coccocarpia plumbea, Lightf., or C. 

 molybdcea, Pers. 



The hymenium gives a beautiful blue with iodine. The paraphyses do not 

 much exceed in length the thecse ; they are sub-discrete and filiform ; their 

 clavate heads (epithecium) are of a brownish or yellowish colour, and are inti- 

 mately united and covered by a colourless, transparent membrane ; the hypothe- 

 cial tissue has also a brownish or yellowish tint. The theca? are -0036" to -0045" 

 long, and 0006" oroad ; 8-spored, with the spores arranged in one or two rows. 

 The spores (fig. 29) are -0009" long, and -0003" broad; ellipsoid, simple, colour- 

 less ; exhibiting generally, in the mature state, a double contour (a). 



25. Psoroma sphinctrinurn, Mnt. (figs. 30, 31). 



On stockyard fences of "Goai" timber, Martin's Bush, Chain Hills ; on living 

 trees, East Taeri Bush ; on the bark of dead trees, Saddlehill Bush. 



An abundant corticolous species in Otago, fruiting freely. The colour of the 



