ACHNANTHES. 401 



wliich circumstance, together with the colour and slender fila- 

 ments, will distinguish it from all other species." — Ralfs. 



67. ACHNANTHES Bory. 



Char. Frond stipitate, sta7idard-shaped, composed of few 

 frustules, 2c]iich are longer than broad, curved, and have a 

 punctum at the centre of the inferior margin. 

 Derivation. From a.%1^77, the froth of the ocean, and avOos, 

 a flower. 



The stipes is attached not to the centre of the lower frus- 

 tule but to one of its angles, and this position of It gives rise 

 to the resemblance of each entire frond to a standard. 



1. ACHNANTHES MINUTISSIMA Kutz. 



Plate C. Fig. 4. 



Char. Frustules small, slender ; in lateral view obtuse, and 

 apparently without stria. Stipes very short. 



Kiitz. Syn. Diatom, p. 578. f. 54. ; Ehr. Infus. p. 228. 

 pi. XX. f. 5. ; Ralfs, In Annals, vol xlii. p. 492. pi. xiv. 

 fig. 2. ; Jenner, In Flor. of Tunbridge Wells, p. 200. 



Hab. Parasitic on other AlgcB, Newtimber, Sussex : Mr. 

 Borrer. Several places in Sussex, &c. : Mr. Jenner. 

 Cheshunt : A. H. H. Oswestry : Rev. T. Salwey. Pen- 

 zance : Mr. Ralfs. Bristol : Mr. Thicaifes. 



The fronds are very minute, and rarely consist of more than 

 two frustules. 



" Before I had the opportunity through ISIr. Borrer's kind- 

 ness of comparing our plant with the specimen in Kiitzing's 

 ' Alg. Aq. Dulc' I considered It a variety of the following 

 species; and I am still uncertain whether they should be 

 separated, although the plant above described Is undoubtedly 

 Kiitzing's Achnanthes minutissima.'" — Ralfs. 



D D 



