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 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