BOTANY Verrucaria, var. subalbicans, Leight. Verrucaria Salweii, Leight. calciseda, DC. rugulosa, Borr. gemmata, Ach. chlorotica, Ach. conformis, Nyl. nitida, Weig. epidermidis, Ach. glabrata, Ach. var. analepta, Ach. albissima, Ach. f. fallax, Nyl. - epipolytropa, Mudd. var. cinereopruinosa, Schaer. - hymenogonia, Nyl. punctiformis, Ach. Melanotheca gelatinosa, Chev. biformis, Borr. FRESHWATER ALG^E Probably Essex is one of the best counties in England for fresh- water algae. It has plenty of small ponds, pools, streams, fresh and brackish ditches, and other conditions so favourable to their growth. Dr. M. C. Cooke writes to me that the Epping Forest district is the best anywhere around London. Of course such species as are to be found only on rocks and in mountainous districts are absent from Essex. The Conjugate and Conferva are well represented, also the Zygne- macea, Desmidiacea and (Edogoniacece. Dr. Cooke has never found CEdogonium crassiusculum anywhere else, nor does he recollect receiving (E. plirviale from any other locality. He says : ' As to species of interest, I fancy that the constant and perennial excursions of the Quekett Club will show that there is always the prospect of something worth going after if it is only Volvox and Gom'um, and Eudorina, the latter especially. For myself, I have never been disappointed in a trip to the Forest district when in search of alga?, having always managed to secure something new, or comparatively interesting.' The following list is by Dr. M. C. Cooke 1 and includes records by himself, Dr. Hassall, E. G. Varenne, Mr. C. E. Mainland, and the excursion lists of the Quekett Microscopic Club. They are from the Epping Forest district and from Kelvedon. No doubt this list would be very considerably extended if the whole county had been explored. Plcurococcus vulgaris, Menegh Pediastrum Boryanum, Menegh Palmella hyalina, Rabenh. rotula, A. Br. Mooreana, Harv. Hydrianum heteromorphum, Reinsert. Porphyridium cruentum, Nzg. Chlamydococcus nivalis, A. Br. Tetraspora bullosa, Ag. Volvox globator, Ehr. lubrica, C. Ag. minor, Stein. gelatinosa, Desv. Gonium pectorale, Muell. Apiocystis Brauniana, Naeg. Eudorina elegans, Ehrenb. Raphidium falcatum, Cooke Sphaerozosma secedens, De Bary Protococcus viridis, C. Ag. Hyalotheca dissiliens, Breb. Chlorococcum gigas, Grun. mucosa, Ehrenb. Scenedesmus obtusus, Meyen Desmidium Swartzii, Ag. acutus, Meyen Docidium Ehrenbergii, Ralfs. quadricauda, Brcb. nodulosum, Brb. Hydrodictyon utriculatum, Roth. baculum, Breb. 1 Eiitx Naturalist, vii. 1 70. i 57 8
