252 ALG.E DIATOMACE.E. [Gomphonema. 



Tribe XXIV. STYLLARIEiE. 



Frustula plane, wedge-shaped. 



93. Licmophora. Ag. Licmophora. 



Frustula wedge-shaped, flabelliform, stipitate. Grev. — Name ; 

 \iK/xo<fiopo<i, fan-bearer. 



\.~L.jlabellata, Ag. Flabellate Licmophora. Densely tufted; 

 when dry green and glistening ; stipes elongated, very much 

 branched; branches alternate; the frustula linear, wedge-shaped, 

 flabelliform. Grev. — Grev. in Hook. Br. Fl. v. ii. p. 409. — Exi- 

 laria Jlabellata, Grev. Crypt. Fl. t. 289. 



Parasitic on marine Algce and Zostera. Bantry bay ; Miss Hut- 

 chins. One of the most beautiful microscopic objects in the whole 

 order of Algae, and admirably represented in Dr. Greville's figure in 

 the Scot. Crypt. Flora. It forms glistening tufts, half an inch in 

 height. 



94. Meridion. Ag. Meridion. 



Frustula wedge-shaped, in plain sessile circles or segments of 

 circles. — Name; pcpis, idos, a portion or particle ; in allusion 

 to the minute fragments which compose it. Grev. 



1. M. circulare, Ag. Circular Meridion. Mucose stratum 

 scarcely any ; frustula united into numerous nearly complete 

 circles. Grev. — Grev. in Hook. Br. Fl. v. ii. p. 409. — Echinella 

 circularis, Grev. Crypt. Fl. t. 35. 



Stagnant waters, among other Algae. Plassey, near Limerick ; W. 

 H. Harvey. 



Tribe XXV. CYMBELLEiE. 



Frustula elliptical. 



95. Gomphonema. Ag. Gomphonema. 



Frustula subgeminate, terminating a very slender, simple or 

 branched filament. — Name ; <yofi(foos, a wedge, and vn/ia, a 

 thread; from the shape of the frustules of the filaments. 

 Grev. 



1. G. minutissimum, Grev. Smallest Gomphonema. Mi- 

 nute, ochraceous, somewhat scattered, entangled ; stipes sub- 

 ramose ; frustules linear, wedge-shaped. Grev. — Grev. in Hook. 

 Br. Fl. v. ii. p. 409. and Crypt. Fl. t. 244. / 1. 



In streams, &c. investing the leaves of grasses, common. 



