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 



