Marine Algae, of Benvick-on-Tiveed. 265 



Order III.— OOSPOEEiE. 



Family— V aucheriace*. 



VAUCHEKIA, D. C. 



Vaucheria Thuretii, Woronin. 



Beit, zur Kenntniss der Yaucherien, in Bot. Zeit. 1869, vol. 

 27. p. 157 t. 2, figs. 30-32. 

 Descr. Vaucheria Thnretii, Farlow, Mar. Alg. New Eng., p. 104. 

 Fig. „ „ Farlow, I.e. pi. iv., fig. 2. 



Exsicc. ,, „ Holmes, Alg. Brit. Rar., no. 75 ; Wittrocl- 



and Nordstedt, Alg. Scand., no. 228. 

 Syn. Vaucheria Thuretii, Noi-dst., Algol. Smasaker, in Bot. Notiser, 

 1879 ; Hauck., Meeresalg., p. 414. 

 Vaucheria velutina, Ag., Rysfc. Addend., p. 312 ; Harv., Phye. Brit., 

 pi. 321 (pro parte.) 

 Hob. Along the muddy banks of the Tweed both above and below the 



old Bridge. July — Oct. Common. 

 A monoecious species forming dark -green cushion-like patches 

 on the mud. The oval, sessile antheridia, usually produced near 

 the apices of the filaments just above the obovate oogonia, are a 

 great guide to the identification of the species. 



Vaucheria sph^rospora, Nordst. 



Algol. Smasaker in Bot. Notiser. 1879, p. 177, t. 2 ; Hauck, 

 Meeresalg., p. 413. 

 E.rsicc. Vaucheria piloboloides. Holmes, Alg. Brit. .Rar., no. 50 (non V. 



piloboloides, Thur.) 

 Hah. Along the muddy shores of the Tweed below the old Bridge, and 



in shaded crevices of the rocks between tide-marks. Rare. 

 A smaller species than the last, and easily recognised when in 

 fruit by the nearly globular sessile oogonia. When growing on 

 soft mud only the bright green tips of the filaments are visible, 

 the lower portion of the threads being entirely buried ; but when 

 growing on mud-covered rocks it forms a sort of short turf 

 which can be cut from the rock in large pieces. 



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