226 Botany. 



Class IV. GREEN ALG/E (Chlorophyceae). 



Group 1. (Edogoniales. 

 OEDOGONIUM rostellatum, Prings Bickley, '00. 



Group 2. Chaetophorales. 

 BULBOCHJETE sp. (?). Keston, '01. 

 ULOTHRIX zonata, Kiitz. Common in gutters, etc. 

 STIGEOCLONIUM tenue, Kiitz. Bickley, Bromley, etc., '01. 

 HERPOSTEIRON eonfervieola, Nag. Bickley, '01. 

 CHUETOPHORA incrussata, Hazen. Keston Ponds, L.C.C. 

 C. pisiformis, Ag. Bromley. 



C. tenue. Keston Ponds, L.C.C. 

 DRAPANALDIA glomerata, Ag. Keston Ponds, L.C.C. 



D. plumosa, Ag. Keston, '84. 



Group 3. Ulvales. 



ENTEROMORPHA intestinalis, L. On piles of Woolwich Ferry, '07, 

 J.F.B. 



Group 4. Schizogoniales. 



SCHIZOGONIUM murale, Kiitz. Common under walls and between 

 damp paving stones. 



Group 5. Microsporales. 

 MICROSPORA sp. (?) Common (R. Beer). 



Group 6. Cladophorales. 

 CLADOPHORA glomerata, Kiitz. Common in streams (Cray). 



Group 7. Siphoneae. 



VAUCHERIA dichotoma, Ag. Ditches east of Gravesend, L.C.C. 

 V. aversa, Hass. Ponds, Eltham. 



V. sessilis, DC. Common in springs, wet places, damp greenhouses. 

 V. terrestris, Lyngb. Hayes, '01. 



Group 8. Conjugate. 



N.O. 1. ZYGNEMACE&. 



MOUGEOTIA parvula, Hass. Keston, '83. 



GONATONEMA Boodlei, W. and G. West. Long Pond, Eltham ; 

 rare. 



