Botany 229 



Class VII, BLUE-GREEN ALG/t, 

 (Myxophyceae, Schizophyceae, CyanophyceaB.) 

 ARTHROSPIRA jenneri, Stiz. Rare. Keston. 

 CHROOCOCCUS cohaerens, Nag. Bickley. 



NOSTOC commune, Vauch. Bromley ; Hayes Common, L.C.C. 

 N. humifusum, Carm. Common in greenhouses. 

 OSCILLATORIA tenuis, Ag. Common on paths, under trees, etc. 

 CYLINDROSPERMUM stagnale, Born, and Flah. Pond, Eltham. 

 RIVULARIA haematites, Ag. Long Pond, Eltham. 



ADDENDA. 



The following maritime and submaritime Chenopods which ascend the 

 estuary of the Thames generally as far as Gravesend were accidentally omitted : 



(1309) Atriplex hastata, L. Frequent; prob. A. deltoidea, Bab. is the 

 more common species inland. (1303) Chenopodium botryodes, Smith. Rare ; 

 Port Victoria (M. & Dod), first record, 1864: Gravesend. (1313) Obiono 

 (Atriplex) portulacoides, Moq. Freq. (1315) Salicornia europaea, L. (her- 

 bacea, L.). Com. Isle of Grain. (1320) Salsola Kali, L. Abt., Isle of Grain. 



The following additions and corrections are recorded by the authors from 

 E. Wickham brickfields : 



Stachys annua, L. ; Erigeron acris, L. ; Euphorbia esula, L. var. b) pseudev 

 cyparissias, Jord., a large well-established clump ; Arnica alpina, Olin & Lin- 

 dau, alien, several plants ; Linaria genistifolia, Mill, non DC., a huge Linaria 

 5 feet high, 1 plant ; Centaurea napifolia, L., an escape ; Melilotus indica, All. 

 (parviflora, Desf.), an alien; Raphanus sativus, L., the cultivated Radish, 

 escapes, several fine plants ; Aster novi-belgii, L., a garden escape ; Melilotus 

 officinalis, L. A few plants in 2 spots, (first recorded by C. H. Grinling ; com- 

 pared with M. arvensis there are 500 plants of arvensis to 1 of officinalis) ; wild 

 escapes of the Sunflower, Jerusalem Artichoke and Tomato. 



Those who wish to connect Botany with Geology should provide them- 

 selves with a Drift Map, Ordnance Survey, London District, Sect. 4. The 

 solid geological maps are of no value for botanical field work. 



In bringing these records to a conclusion, we acknowledge the services 

 rendered to us by Mr. C. H. Grinling, who has, with great care and acumen, 

 reviewed the whole work from its inception to the last proof, and many of whose 

 suggestions have been embodied in the foregoing pages, and by Mr. W. 

 Williams, F.L.S., chief officer of the L.C.C. Botany Scheme Dept., Avery Hill, 

 who has assisted us in many ways in all parts of the work. J.F.B. & W.H.G. 



