Knight.— 0^ some Nqw Zealand Lichens. 357 



3*. Lecidea parasemaj Ach. 



L. parasema, Ach. (Nyl. in Lich. Scand. p. 217), described in Handbook 

 N.Z. FL, p. 584, I have not succeeded in collecting in New Zealand, and it is 

 most likely that the common lichen, L. niyriocarpa, DC, has been mistaken for 

 it. This latter plant is common in New Zealand, although not described in 

 the Handbook. The thallus is ashy-green, thin, subgranular, and determinate. 

 The apothecia small and margined. Spores uniseptate, brown, 0*013 millim. 

 long, and 0*008 millim. broad. Hypothecium black or obscurely brown. 



Syn. L. 'punctata, Schcer. Exs. 197, and L. punctata g. denudata, Schoer, 

 Exs. 529. 



It is true that our lichen agrees with those in the collections of Leighton 

 from Great Britain, and others from Germany and Scandinavia, under the 

 name of L. parO^sema, but in every specimen that I examined of those collections 

 the character agrees with L. myfiocarpa, to which species in fact they belong. 



4. Lecidea radomma, Nyl. in lift. 



Thallus cinereus, granulosus. Apothecia atra, superficialia, mediocria, 

 plana, margine prominente. Sporce octonss; incolores, ellipsoidese, biloculares, 

 plerumque tubulo loculos jungente, longit, 0*025 mm., crassit. 0*015 mm. 

 Stratum hypothecii subhymeniale fuscum, stratum excipulare album. 



Ad cortices arborum. 



Thallus ashy, granular. Apothecia black, superficial, medium size, flat, 

 with prominent margin. Spores eight in each ascus, colourless, ellipsoid, 

 bilocular, cells united by a tube, 0*025 millim. long, 0*015 millim. thick. 

 Subhymeneal stratum brown, excipular stratum white. 



On bark of trees. 



Differs from L. leucoplaca, Chev., in the excipulum being white, and the 

 spores mostly with a connecting tube between the cells. 



5. Lecidea tnarginiflexa. 

 Montague considers this plant to be L. tuberculosa, Fee (Flora N.Z., p. 299). 

 This is a mistake. Fee's lichen has multilocular spores, while L. marginiflexa 

 has uniseptate spores and only one spore in each ascus. 



Lecanora pa/rella var. implicata. 



Differs from the typical form in the thallus being neither granular nor 

 warty, but rugose. In this it resembles a corticular specimen collected by 

 J. P. Norlin at Tavastia Asikkala. The disk is more coloured than usual in 

 Buchanan's specimen, and is convex or flat in the full grown apothecia, as is 

 sometimes the case in L. tartarea. Specimens are seen in all stages between 

 slightly rugose and warty. One, which Nylander has named L, thelotremoides, 

 is clearly intermediate between L. implicata and L» parella, 



Syn. Lecanora implicata, Stirton. 



