20 . 



elliptical, large, simple, coarsely granular. Disk of apothecia ren- 

 dered slightly darker by K, but not red. 



This lichen has a proper margin, and as the apothecium is attached by 

 a broad central basis, the thalline receptacle is seen covering it and the 

 ■unattached portion, but ceases considerably below the proper margin.- 

 Spores, •043x-021 m m.— On trees, 1000 to 1500 feet. 



Verrucaria Wellingtonii (Sp. Nova). — Thallus a dirty brownish cream 

 colour, thick, continuous, smooth; apothecia large, immersed; peri- 

 thecium entire, globose ; epithecium depressed, dark brown, poriform ; 

 spores eight, colourless, very large, oblong, fusiform, acutely pointed, 

 muralireticulate, enveloped in a double hyaline membrane which is 

 most perceptible in a young state, when, also, the contents are coarsely 

 granular ; paraphyses distinct, filiform, numerous. — A very remarkable 

 lichen. On trees. 



Astrothelium prostratum (Sp. Nova). — Thallus well developed, con- 

 tinuous or rimulose, thin, yellowish white, merging into grey or 

 cinereous ; apothecia compound; receptacle black, large, broad ("02 to 

 •07 in.), shallow, scarcely raised above the general surface ; perithecia 

 entire, irregular in outline, and all apparently opening into one ostiole 

 which shows on the surface ; spores eight, uniserial, colourless at firsts 

 when the contents are coarsely granular, becoming brown when mature,, 

 with six cross bars, which assume the appearance of oval coloured cells ; 

 pai'aphyses plentiful, filiform, simple. — On bai-k. 



Squamaria gelida (L.). — The apothecium of this lichen is difierently 

 constituted from that in this country, inasmuch as the thalline exciple 

 resembles the cup of the acorn, while there is a proper border, smooth 

 and prominent, surrounding the epithecium, which is itself white, prui- 

 nose and rugose. I can see, however, little difference otherwise ta 

 warrant a separation. 



Parmelia implexa. (Sp. Nova). — Thallus yellowish brown, smooth 

 above, closely adherent, intricately divided into small lobes which are 

 roundly laciniated; under surface white, tomentose (much more so than 

 visual), attached to the bark by a dense mass of coarse, stiff, black, 

 branching rhizinse, which extend considerably beyond the thallus j. 

 apothecia moderate, brown, surrounded by a deeply incised lobular 

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

 disk; spores eight, simple, elliptical, moderate; paraphj'ses not discrete, 

 agglutinate at their apices; hypobhecium 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 



