284 NOSTOCIIINE^E. 



here and there to a spherical cell, which is sometimes 

 terminal. 



1. SPH^ROZYGA JACOBI Ag. 



Char. Threads radiating, lonely, disposed in gelatine. 

 Sphcerozyga Jacobi Berk., in Eng. Bot. t. 2826. fig. 2. 



Hob. Northamptonshire : Rev. M. J. Berkeley. Cromlyn 

 Bog : J. W. Gutch, Esq. 



This species would appear from the description to belong 

 to Anabaina or Aphanizomenon. I have never seen it. 



36. TRICHORMUS Allman. 



Char. Frond free, of undeterminate figure, consisting of simple, 

 minute, moniliform, curved threads, with articulations of 

 uniform size, immersed in a gelatinous matrix. 



Derivation. From Spi};, hair, and opfios, a necklace. 



" From Anabaina of Bory Saint Vincent the present 

 Alga, as well as that of Mr. Thompson {Anabaina ? spiralis}, 

 differs in the uniform size of the articulations, Bory's genus 

 being characterised by larger globules occurring at distinct 

 intervals in the series." Allman* 



Although strongly inclined to agree with my excellent and 

 early friend Dr. Allman, as to the validity of the genus Tri- 

 chormus, I am still not altogether satisfied respecting it, the 

 suspicion resting on my mind that the T. incurvus Allm. 

 might possibly be an Anabaina in a young stage of its 

 developement, the reproductive enlarged cells not having as 

 yet manifested themselves. This, however, is but a suspicion, 

 against which may be urged the fact that in veritable Ana- 

 baina the globules are invariably found interrupting the 

 uniformity of the filaments. 



* " On a New Genus of Algae, belonging to the family of the Nosto- 

 chineaj." By G. J. Allman, A.B., L.R.C.S.J., Secretary to the Dublin 

 Microscopical Society. Annals of Nat. Hist. vol. xi. p. 161. 



