CLOSTERIUM. 375 



pi. ii. Sanaitica, f. 9. 1828. Closterium multistriatum, 

 Abhandl. der Akademie d. Wissensch. zu Berlin, 1829, 

 p. 15 20. Closterium acerosum, Symbolae Physicae, 

 Evertebrata, text 1830 (1831); Polygastrica, fol. b. 

 a. 2. Closterium acerosum, Abhandl. der Akademie d. 

 Wissensch. zu Berlin, 1831, p. 68. Closterium Lunula 

 Morren, fig. 43. ; Ehr. Infus. p. 93. pi. vi. fig. 1. Cym- 

 bella Hopkirkii Moore, in Ord. Survey; Harv., in 

 Manual, p. 215. Cl. acerosum Jenner, in Flora of 

 Tunbridge Wells, p. 196. Conf. ovata, Flora Glottiana. 



Hob. Near Glasgow : Mr. Hopkirk. About Lisburn and 

 in one of the caves, Cave Hill, Belfast: Mr. Moore. 

 Warbleton, &c. : Mr. Jenner. Galway: M'Colla. 



There is no species hitherto described with which it is 

 necessary that this should be compared, the straight and 

 fusiform frond rendering it clearly distinct from all other re- 

 corded species. This species was named by Mr. Moore Cym. 

 Hopkirkii, in memory of Mr. Hopkirk, author of " Flora 

 Glottiana." 



e. Closteria straight, not lunar. 



12. CLOSTERIUM TRABECULA Ehr. 

 Plate LXXXVIII. Fig. 3. 



Char. Frond broad, longitudinally symmetrical, somewhat 

 quadrangular. Granules scattered or disposed in several 

 series, ^ndochrome fasciated. Bands several. 



Closterium Trabecula, Abhandl. der Akademie d. Wis- 

 sensch. zu Berlin, 1830, p. 62. 70. ; 1831, p. 68. ; Ehr. 

 Infus. 93. pi. v. fig. 2. ; Jenner, in Flora of Tunbridge 

 Wells, p. 196. 



Hob. Rusthall Common ; Piltdown Common ; Scrubbs, 

 Colebrooke Park ; Waterdown Forest : Mr. Jenner. 



This Closterium bears some resemblance in form at least to 

 Cl. margaritaceum, but differs from that species in being 

 altogether much larger, in its entire margins and in the posi- 



B B 4 



