284 NOSTOCHINEiE. 



here and there to a spherical cell, which is sometimes 

 terminal. 



1. Sph^rozyga Jacobi Ag. 



Char. Threads radiating, lonely j, disposed in gelatine. 

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



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

 Bog : J. W. Gutch, Esq. 



This species would apj)ear from the description to belong 

 to Anabaina or Aphanizomenon. I have never seen it. 



36. TKICHOKMUS Allman. 



Char. Frond yV^^, of undeterminate figure, consisting ofsimjAe, 

 minute, moniliform, curved threads, with articulations of 

 uniform size, immersed in a gelatinous matrix. 



Derivation. From ^pi^, hair, and opixos, 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. iiicurvus AUm. 

 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- 

 baincB the globules are invariably found interrupting the 

 uniformity of the filaments. 



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

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

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



