606 SOME SYDNEY DESMIDS, 



Cl. strigosum. I give, above, a description of this form which is* 

 about the same size as Cl. lineatum, and somewhat resembles it 

 in shape. This is not striate, however, and only faintly rufescent. 

 More mature forms are more evenly attenuated and curve more 

 regularly towards the tips which are then very slightly reflexed. 

 A semicell of one in Mount No. 1 6,B., measures 396/x, giving a 

 possible length for the mature cell of nearly 800/i. These forms 

 are probably identical with Nordstedt's Cl. praelongumi. brevior> 

 Frw. Alg. N.Z., T.3, f. 22-24, some specimens of which, he says, 

 approach CI. strigosum, in shape (I.e. p. 68). It is possible there- 

 fore that CI. strigosum is a young form of CI. praelongum. 



Cl. Delpontei Wolle, Bull. Torr. Bot. Club, xii. 1885, p.2. 



CI. crassum Delp., Desm. subalp. T.18, f.22-30; — Cl. lineatum 

 j8 Sandvichense Nord., Alg. et Char. Sandv. T.l, £.10-12. 



Forma typica : — crassa, plerumque dorso arcuata. Zygospora 

 globosa glabra. 



Long. 420-696; lat. 39-48; lat. apic. 9, zygo. diam. 70-80/x. 



Botany (51); Centennial Park (71); Coogee. (4, 13); Auburn 

 (16); Guildford. 



Var. rectum, mihi; = C7. lineatum Ehr., forma, Borgesen, 

 Desm. Braz. Cent. T.2, f.4. 



Forma angustior, plerumque in medio recta, ad var. elongatum 

 West & West (Frw. Alg. Ceylon, T.18, f.20), valde accedens sed 

 diametro duplo major. 



Long. 450-756; lat. 22-34; lat. apic. 5J-9 M . 



Cum priori rarius (4, 15, 16); solum, Duck Creek, Auburn (74). 



Raciborski (Desm. Ciast. p. 9) gives 420 x 22, lat. subap. 7, 

 as the size of a Sydney specimen; and Borgesen, I.e. p. 934, has 

 650 x 29. I have found specimens of f. typica and var. rectum at 

 Auburn with an almost colourless membrane but still finely 

 striate. Mount No. 16. 



Var. elongatum West & West, I.e. forma. (Plate xi., fig- 4). 



Forma in sciagraphise simillima,sed striis nullis,membrana inter- 

 dum sparse scrobiculata, apicibus paullulo dilatatis et incrassatis. 

 Endochroma tantum non ad summos apices patet. 



