FRESH-WATER ALG-E OF HAMPSHIRE. 



C. macilentum Breb. E. 



C. strigosum Breb. E. 



C. Lundellii Lagerh. E. 



0. graciU Breb. E. 



C. Leibleinii Kg. E . W. M. R. H. 



C. calosporum Wittr. E. 



C. Diana Ebr. E. 



C. Venus Kg. E. W. 



C. incurvum Breb. E. 



C. arcuatum Breb. E. 



C. Lagoense Nordst. E. 



C. striolatum Ehr. W. 



D. Ehrenbcrgii Ralfs. E. P. M. 



— /3. granulation Ralfs. E. 

 D. clavatum Kg. E. W. 

 D. truncation Breb. E. M. 

 D. rectum Delp. E. P. 

 Closteriumdidymotocum Corda. E. 

 C. Bailey anion Ralfs. E. 

 C. obtusum Breb. E. 

 C. Lunula Ebr. E. 

 C. Ehrenbcrgii Menegb. H. 

 C. moniliferum Ebr. H. 

 C. acerosum Scbr. E. R. 

 C. antiacerosum De Not. E. 



C. striolatum /3. orthonotum, n. var. E. P. "W. Upper side flat, 

 straigbt for about half the length of the frond ; eleven to twelve times 

 longer than broad; from one-sixth to one-fourth longer than the 

 typical form, by two-thirds of its breadth ; in colour and striation the 

 two are similar ; zygospore unknown. Length, 320-390 p ; breadth, 

 32 p; do. at apex, 8-10 p. If nothing more, this is at least a very 

 distinct as well as a common var. It maintains its characteristics, 

 with very slight variation, in such widely separated regions as South 

 Africa and New Zealand. Mr. Archer considers it a good species, 

 and probably he is right. I prefer in the meantime to put it as a 

 var. till the zygospore and mode of conjugation are known. The 

 conjugation of the typical (regularly curved) form is quite the same 

 in South Africa as here. It is very well represented by Ralfs 

 (' Brit. Desmid.' tab. xxix. fig. 2g). Ehrenberg gives a figure of 

 the conjugation (' Infus.' Taf. vi. fig. xii. 6), which differs so much 

 from that of Ralfs that it is very doubtful if both had the same 

 species in view. Ralfs' fig. 2 h is evidently something quite different 

 from his 2g. Neither of these represents the new var., but 2b and 

 2/, though not very characteristic, seem to belong to it. His other 

 figs., 2a, 2d, 2e, and 2g, undoubtedly represent the striolatum of 

 Ehrenberg (i.e., figs. 1-5); his figs, c and h are doubtful. 



C. Malinvemicum De Not. W. 



C. intermedium Ralfs. E. 



C. juncidum Ralfs. — /3. brevior 



(forma brevior et rubustior Ra- 



benb.). E. 

 C. attenuation Ebr. E. 

 C. lineatum Ehr. E. 

 0. rostratum Ehr. E. W. 

 (J. Eutzivgii Breb. E. H. 

 C. setaceum Ehr. E. 

 C. pronum Breb. P., abundant. 

 C. cornu Ehr. E. 

 C. ceratium Perty. E. W. 

 C. acutum Breb. E. H. 

 C. linea Perty. E. P. 

 Penium margaritaceum Breb. E. 



P. Digitus Ebr. E. 



P. Xagellii Breb. E. 



P. lamellosum Breb. E. 



P. Libeliula Focke {P. closteri- 



oides Ralfs). E. 

 P. navicida Breb. E. 

 P. interruption, Breb. E. 

 Cylindrocystis BrebixsoniiRalh. E. 

 Mesotanium Braunii De Bary. E. 

 M. riuluscens DeBary. E. 

 Tttmemurus granulatus Breb. E. 

 Spirotamia obscura Ralfs. E. 

 S. minuta Thuret. E. 

 6'. parvula Archer. E. 

 MicrasteriasangulosaIlsLntzsch.~E. 

 M. denlieulata Breb. E. 



