

















REVISION OF THE BRITISH WILLOWS. 



457 



• • 





•• 













- 





Salix 



. sphacelata, Sm., 386. 

 • splendens, Bray, 370. 

 spuria, Willd., 430. 



Stephania, B. White, 424. 

 stipularis, Sm., 414, 415. 

 strepida, Forbes, 408. 

 Stuartiana, Sm., 426. 

 subdola, B. White, 354. 



8ubpurpurea-cinerea, Kern., 45 

 superata, B. White, 423. 

 tenuifolia, Sm., 402. 

 tenuior, Borr., 402. 

 tephrocarpa, Wimm., 402, 406. 

 tetrapla, Walker, 400. 

 thymelaeoides, Schleich., 411. 

 Trevirani, Spreng., 355, 358. 

 triandra, L., 347. 



tnandra X alba, 354. 



triandra X fragilis, 348. 



triandra X viminalis, 355. 

 undulata, Ehrh., 355. 



Salix 

 vacciniifolia, Walker, 411. 

 vaudensis, Forbes, 408. 

 velutina, Schrad., 414, 418. 

 venulosa, 5w., 410. 

 viminalis, £., 413. 



viminalis X purpurea, 448. 



vim inalis X repens, 39 1 . 



viminalis X Caprece, 413. 



viminalis X triandra, 355. 

 virainalis-purpurea, Wimm., 448. 

 viminalis-repens. Lasch, 391. 

 viridis,tfr., 363, 367,371. 



vitellina, L., 371. 

 Wahlenbergii, And., 433. 

 Waldsteiniana, Willd., 411. 

 Wardiana, B. White, 402, 403. 

 Weigeliana, Willd., 400. 

 Woolgariana, Borr., 447. 



Synandr.e, 447. 

 Triandra, 347. 

 Viminales, 413. 















Life-History of a Stipitate Freshwater Alga. By Gkoroe 



Mas&e. (Communicated by the Secretary.) 













,: 





[Bead 5th December, 1889-1 



( Plate XII. ) 



The genus Dicfyosphcerium was established by Nageli* for the 



reception of 



a very remarkable freshwater 



alga 



Dictyo- 







»ph(erium Ehrenberoianum, Nag., found floating in ditches near 

 Zurich. 



The generic diagnosis is accompanied by good figures and an 

 excellent description of the leading morphological features of the 

 plant. 



The following closely allied " species " are all that are known up 

 to the present : 



































. 





Dictyosph^rium Euuenberoianum, Nag. Einz. Alg . p. 73, 

 *• »• E; Sab. Alg. Eur. sect. iii. p. 47, f. 20 (dcxtra); 

 W olle,Alg. U. States, p. 186, pi. clvi. ff. 29-30; Cooke, Brit. 

 Al 3- P- 20, pi. ix. f . 1. 



^ICTYOSrHamiUM 



EF.NIFOKME, 



Buln. in Bedw. ii. p. 22, t. i. 



* Gatt. Einzel. Algen, p. 72, t. ii. E (1848). 



LI *N. JODRN.— BOTANY, VOL. XXVII. 



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