236 Transactions. — Botany. 



Sticta hirta, Stirton. 



Notwithstanding the varied forms assumed by Sticta urvillei, I am 

 tempted to elevate into the rank of a species one of the several specimens sent. 



Thallns widely expanded, reticulate-foveolate, broadly and roundly lobed, 

 covered in many places with dense clusters of yellow isidiose effloi'escence, 

 under surface dark brown, densely tomentose ; ajjothecia reddish brown 

 merging into black, margin composed of a mass of radiating isidiose excrescence, 

 which, in many instances, almost covers the disk ; sj)Ores as in the variety 

 colensoi. 



On bark of trees, Kaka Hill, Wellington. 



Psoroma implexa, Stirton. 



Thallus yellowish brown, smooth above, closely adherent, intricately 

 divided into small lobes, which are I'oundly lacinated, under surface white, 

 tomentose (much more so than usual), attached to the bark by a dense mass of 

 coarse, stiff, black, branching rhizinse, which extend considerably beyond the 

 thallus ; apothecia moderate, brown, surrounded by a deeply incised lobular 

 inflexed thalline margin, which, in a young state, almost conceals the disk j 

 spores eight, simple, elliptical, moderate ; paraphyses not discrete, agglutinate 

 at their apices ; hypothecium yellowish brown, grumous. 



I have given a rather minute description of a lichen which has puzzled me 

 considerably, mainly for the purpose of calling attention to it, as I cannot 

 pretend to an intimate knowledge of this intricate and perplexing genus. 

 The chemical reactions of K and C on the upper su.rface and medulla are 

 (K-C-). 



On rocks, Tinakori Hills, Wellington. 



Psoi'oma artliTooiohylhmi, Stirton. 



Thallus greyish brown, thick, continuous, brownish black, and rough on 

 the under surface, multifido-laciniate above ; lacinise closely imbricated, 

 ascending, broad, mai'gins roundly crenate, their under surface somewhat 

 paler ; apothecia large, rufous, rugose margin elevated, granuloso-concrete ; 

 spores eight, colourless, spherical, crenulate, in nearly single file in asci; 

 paraphyses indistinct. 



This may be Psoroma euphyllnni (Nyl.), of which no description is given 

 in the "Flora of New Zealand," nor in any of the later papers to which I have 

 access. 



On bark of trees, Tinakori Hills, Wellington. 



Pannaria crustata, Stirton. 

 Thallus dark greenish olive, squamuloso-crustaceous, areolate-diffract j 

 squamules largish, rugose, round, with crenulate turned-up margins ; hypo- 

 thallus black, evident ; apothecia reddish brown, moderate, flat, or somewhat 



