60 LICHENOLOGICAL MEMORABILIA. 



Arthonia pxoximella, Nyl.— Thallus effuse, hypophlseodal, silvery- 

 grey ; ardellae nigro-fuscous or black, minute, round, lecideoid, 

 opaque, plane, internally nigrescent ; spores 8, fuscous, obovate, 

 1 -septate. 



On hollv, rare. Gwydir woods. 



Syn.— Nyl. Lich. Scand. p. 262. (1861). 



Fig.— Plate 4, fig. 3., a. b. c. 



Exs.— Fellman 208. 



Arthonia aspersella. Leight, n. sp. — Thallus pale-yellowish, 

 maculari-effuse ; ardelke very minute, scattered, pnnctiform, linear 

 or angulari-confluent, black or nigro-fuscous ; hymenium untinged 

 by K; spores 8, colourless, obovate, 1 -septate. 



On holly ; Gwydir woods. 



This lichen assimilates in general aspect with A. vinosa, var. 

 pineti, but in that the ardellae are roundish, and the hymenium is 

 tinged red-purple with K. ; whilst in aspersella the ardellae are 

 remarkable for a peculiar sharp angularity, and the hymenium is 

 untinged by K. (Plate 4, fig. 4, a. & b.) 



On one rock in the Gwydir woods, I met with, what I believe to 

 be, the sterile thallus of Arthonia decussata, Fw., which is per- 

 fectly identical with Zwackh 10. A. & B., and Mass. 123, and has 

 similar reaction K — C red. This is new to the British Flora, and 

 is mentioned here to induce further research for fructified speci- 

 mens. 



Endocarpus Jluviatile, (D.C.), in small quantities on wet 

 rocks. Verrucaria epidermidis, Ach., f. fallax, Nyl. ; V. puncti- 

 formis, Ach., V. autecellens, Nyl. (Leight. Lich. Fl. G. B.), see 

 plate 4, fig. 2, a. b. c, and to which as Exsiceati may be quoted 

 Zw., 363, A. & Hepp. 954, rather abundant on hollies. The cells 

 of the spores have a singular tendency to become spuriously sep- 

 tate ; V. biformis, Borr. ; lectissima, (Fr.), very plentiful ; V. chlo- 

 rotica, (Ach.), and its f. carpinea, 8ch,er. ; V. nitida, (Weig.) 

 especially plentiful, and also a remarkable form or state, on old 

 laurel and other trees, having a nigro-fuscous thallus resembling an 

 indeterminate, diffuse, dark-brown, oily stain, which may be named 

 f. elwodes, Leight. ; V. horistica, Leight. (Lich. Fl. G. B., 451), 

 abundant on rocks. (Plate 4, fig. 1, a. b. c. d.) 



I may mention that the duplicates of the above collections will 

 be made up into a few sets for distribution at 30s. per 100 speci- 

 mens. First applicants will have the most complete sets. 



Old Nettle Stems and their Micro-Fungi is the title of a 

 communication, by the Editor, which appears in the current number 

 of the Journal of the Quekett Microscopical Club. It contains 

 also a paper by C. H. Peck on Cucurbitaria morbosa, Schwein. 



