A HISTORY OF HERTFORDSHIRE 



ought to yield a good number of species, but we have not a single record 

 from them. 



The nomenclature and sequence of species in the following list is in 

 accordance with Leighton's Lichen F/ora, the thirty-five Herts species 

 recorded in Pryor's Flora being here increased to sixty-seven. 



CoiXEMACEI 



Collema pulposum (Bernh.) 



cristatum (Hoffm.) 

 Leptogium lacerum (Ach.) 



LICHENACEI 



Calicium melanophaeum, Ach. 



hyperellum, Ach. 



trachelinum, Acb. 



curtum, Borr. 

 Baeomyces rufus, DC. 

 Cladonia pyxidata, Fr. 



pyxidata, var. fimbriata, Hoffm. 



furcata, Hoffm. 



silvatica, Hoffm. 



rangiferina, Hoffm. 



Usnea barbata (Z..), var. plicata (Z,.) 

 Alectoria jubata (Z,.) 

 Evernia furfuracea, Mann. 



prunastri (Z,.) 

 Ramelina calicaris (Hoffm.) 



farinacea (Z.) 



fraxinea (Z..) 



fastigiata (Pers.) 



polinaria, Ach. 

 Peltigera canina (Z,.) 



polydactyla, Hoffm. 

 Parmelia caperata (Z,.) 



olivacea (Z,.) 



physodes (Z,.) 



perlata (Z..) 



Borreri (Turn.) 



perforata, Wulf. 



saxatilis (Z..) 

 Physcia parietina (Z,.) 



ciliaris (Z,.) 



pulverulenta (Schreb.) 



LICHENACEI (continued) 

 Physcia stellar^ (Z,.) 



var. tenella (Scop.) 

 Placodium murorum (Hoffm.) 

 Lecanora candellaria (Ach.) 



varia (Ehrh.) 



atra (Huds.) 



subfusca (Z,.) 



parella (Z,.), forma Turneri (Sm.) 



albella (Pers.) 



phlogina (Ach.) 



sophodes (Ach.) 

 Pertusaria communis, DC. 



fallax (Pers.) 



faginea (Z,.) 



globulifera (Turn.) 



leioplaca (Ach.) 

 Phlyctis argena (Ach.) 

 Lecidia ostreata (Hoffm.) 



quernea (Dicks.) 



parasema (Ach.) 



uliginosa (Schrad.) 



canescens (Dicks.) 



myriocarpa (DC.) 



den i grata, Fr. 



tricolor (JFith.) 



caradocensis, Leight, 



sabuletorum, Flk. 



cupularis (Ehrh.) 

 Xylographia flexella (Ach.) 

 Opegrapha atra, Pers. 



varia, Pers. 

 Arthonia astroidea, Ach. 



Swartziana, Ach. 

 Graphis scripta, Ach. 





THE FUNGI 



Most of the field meetings of the Hertfordshire Natural History 

 Society are held in the spring and early summer, but there is usually 

 one meeting in the autumn which is called a ' fungus foray,' its object 

 being to investigate the fungus flora of a definite area at the time of the 

 year when the largest number of species is likely to be found. These 

 forays were commenced in the year 1882, and have varied in date from 

 October i3th to November 4th. The following localities have been 

 visited, some of them several times : In the Colne district : Cassiobury 

 Park, Grove Park, the Tunnel Woods and Aldenham Woods, in the 

 neighbourhood of Watford ; Bricket Wood, between Watford and 

 St. Albans ; Verulam Woods, the Hollows, and Gorhambury Park, 



70 



