Apr. 1S94.] BOTANICAL SOCIETY OF EDINBUKGH. 



213 



If these experiments on wheat were considerably multi- 

 plied, using rather larger quantities of the seed, no doubt a 

 more decided result mi^ht be obtained. 



On Acrosiphonia Teaillii, a new British Alga. By 

 Edward A. L. Batters, B.A., LL.B., F.L.S. 

 (With Plate II.) 



Acrosiphonia Traillii, J. G. Ag. (Batt. in Herb.). — Eila- 

 ments slender, one or two inches long, tufted and densely 

 matted at base, becoming free and divergent above ; colour at 

 first dark green, but soon becoming brownish olive ; tufts com- 

 posed of numerous separate bundles ; branches near the base 

 rhizoidal, recurved, and interlaced ; upper branches erect, 

 opposite, or subsecund ; main axis distinct, composed of one 

 or two long branches beset with opposite or scattered ramuli ; 

 the ultimate branches of two kinds, the one having apices 

 drawn out with a long slender point, the other of nearly equal 

 diameter throughout, with very obtuse apices. The spiny 

 branches greatly outnumber the blunt ones, but both kinds 

 are sometimes found side by side. Hooked branches are 

 present, but in very small numbers. Fertile cells 1-2| 

 times as long as broad. Average width of filaments 110 /i. 



