110 THE JOUK>'AL OF BOTAXT 



crit. Lich. Eiirop. (1850), since Lichen multijidus Scop. (1792) ante- 

 dates L. onelceniis Ach. (1798). 



Collemopsis lecanopsoidts Njl. On thin soil-cap of calcareous 

 wall, Henlade, near Taunton (5). In this plant the algal constituent 

 is not Nostoc, but has been attributed by M. Bornet to the Scyto- 

 nemacecB. It has been placed under the genus Porocyphus as 

 P. areoJafus (Flot.) Krb. 



CoUemodium andegavense (Hy.) is very near to C. turgidum, 

 but the thallus is less plicated and has the appearance of a small 

 Cullema p)uIp>osum. The hypotheciuin consists of stratified pseudo- 

 parenchyma, the spores are (>-8-na?, often over 80 /.t long, thinner at 

 one end and with 4-5 transverse septa with a few longitudinal 

 divisions. So far as I know this has not been recorded from the 

 British Isles, but it occurs on limestone walls near Taunton (5). 



C. fluviatile (Huds.) Nyl. On rocks in or near stream, Cray, 

 Wharf edale. 



Lrpfogiiim ptisilhim Nyl. In fallow field on earth or stones, 

 Aisholt (5). 



Peltige7'a canina var. memhranacea Ach. is not uncommon. I 

 have specimens from Luxborough and Exford (5), Harlech (48), 

 Llanberis (49), Mulgrave wood (62, from Mr. Hebden). In the 

 Lich. de Fr. it is placed under P. canina f. leucorrliiza (Flk.) Harm. 



P. rufescens form prceiextata is a not uncommon form. A similar 

 form also occurs in P. canina. 



Pannidaria nigra. The algal constituent is not Xosfoc, and the 

 plant is therefore given by some authors as Placynthiiim nigrnm Ach. 

 In Somerset the spores are often triseptate, but otherwise the speci- 

 mens do not agree with the subspecies P. psoiina. 



Calicium melanopliceum Ach. (= Cyphelium meJanopli<xum 

 Mass.). On tnmks of old pines, Quantocks, Somerset (5). 



Conioci/he furfuracea form fulva Fr. In shadv crevice of wall, 

 Killin (88). 



Ilamalina farina cea form pendula Ach. On beech, Exford (5). 



R, farinacea form plialerata Ach. On pales, Cole (6) ; on oak- 

 tree, Killin (88). 



P. fraxinea var. ampliafa is not uncommon in Somerset. The 

 form monophyUa Cromb. is rare, but occurs at Norton Fitzwarren (5). 



R. fraxinea var. calicariformis Nyl. has the spores of li. fraxinea, 

 but the appearance of It. calicaris. Corfe (5). 



P. pollinaria form humilis Ach. On trees and brick walls in 

 Taunton district (5). When it occurs on trees forms intermediate 

 with the type are common, but when on brick walls intermediates are 

 r;ire, and the plant then ajopears to be worthy of a higher status than 

 that of a form. 



R. hroviiiHcala ^y\. On wall, Woolacombe (4). On rocks near 

 Harlech (48). 



P. scopalorum (Retz.) Ach. var. incrassafa Nyl. On rock, 

 Minehead (5). 



P. cuapidafa form minor Nyl. On rock, Minehead (5). 

 Usnea arficulata (L.) HofFm. Exton (5), near Gai-e hill (6), 

 Bmdlev wood (8). 



