162 SYNOPSIS OF BRITISH SEAWEBD8. 



ordinary size and luxuriance. These arc never exp - 

 low water, andean only be reached inaboal ; bul in shady 



.Is and poolfl between tide-marks, even at BOm< 



above the iow-^i ater Limit, specimens of nearly egnaJ 

 size, attached to smaller Alga?, arc frequently met with. 



XC. YAUCHEKIA. 



286. submarina (The submarine Vaucheria) ; " forked fa«tigiatc 

 threads; coniocystse (sporangia) numerous, lanceolate and 

 ovate, confined to the upper branches," Berk. Gl. Br. Alg. 

 p. 24, t. 8. (Atlas, PI. LXII. Fig. 291.) 



Vaucheria dichotoma, var., Ay. 



Hab. On the muddy sea-shore. 



I am only acquainted with this species through Mr. 



Berkeley's description and figure, both of which I have in 



• Phycologia Britannica,' with his permission, made use of. 



2S7. marina (The marine Vaucheria) ; filaments loosely tufted, 

 or distinct ; brandies few, very long, obtuse ; sporangia soli- 

 tary, obovate, pedicellate, lateral, Lyngb. 11yd. Dan. p. 79. 

 t. 22. (Atlas, PI. LXII. Fig. 290.) 

 Hah. On sea-plants, mud, etc., between tide-marks. Annual. 

 Summer. 

 Not being able to prepare a satis factory figure of this 

 plant from dried specimens, and not having access to re- 

 cent ones, the figure in ' Phycologia Britannica ' is copied 

 from the work of Lyngbye. 



288. velutina (The velvety Vaucheria) ; filaments creeping 

 branches erect, fastigiate, woven into a velvety stratum 

 sporangia solitary, globose, lateral, on short stalks, ^7. Syst, 

 p. 312. (Atlas, PL LXII. Fig. 292.) 

 Sab. On the muddy sea-shore, and on mud-covered rocks, bc> 

 tween tide-marks, generally above half-tide level. Annual 

 Spring and summer. 

 "When properly developed, as on flat, muddy shores, the 

 velvety stratum of this plant frequently carpets the mud 

 with its intense green coating, over a very large extent of 

 surface. The filaments of which the mass consists are in- 

 extricably and most closely woven together. To the naked 

 eye V. velutina bears a close resemblance to the fresh- 

 water V. ccespitosa, but is less cushioned, and the upright 

 branches forming the pile are shorter. 



