Tribonemacece 



2.57 



Linnseus, and certainly none of them were distinguished by him from other 

 simple filamentous forms. 



"For Lagerheim's group of species, as for all genera, the adoption of a 

 generic name based on a recognizable species, as a type, is essential. The 



Fig. 121. A G, Tribonema bombycinum (Ag.) Derb. & Sol. ; A, from Shipley, 

 W. Yorks. ; B, showing aplanospores (a^), from Senens, Cornwall; C, zoogo- 

 nidium, and D F, young plants, from Senens, Cornwall (all x 450) ; G, after 

 treatment with potassium hydrate (after Bohlin, x 570). H and I, T. bomby- 

 cinum forma minor (Wille) nob. ; H, from Shipley, W. Yorks. ; I, showing 

 aplanospores (op), from near St Just, Cornwall ( x 450). J, Bumilleria pumila 

 W. & G. S. West, from near Senens, Cornwall ( x 450). 



earliest such name in the present case is Tribonema Derbes & Solier (1856) l . 

 This genus was based on a single species, Conferva bombycina, and in the 

 diagnosis, for the first time in the history of the species, explicit mention was 

 made of the most essential character, namely, the form of the chromatophores, 

 although it had been previously suggested in the plates of Kutzing. The 

 method of zoospore dispersal was also first described and illustrated by Derbes 

 & Solier. There is, then, every reason for employing the name Tribonema as 

 a memorial of the discernment of these authors." 



1 Derbes & Solier, Me"m. sur quelques points de la physiologie des Algues, 1856. 

 W. A. 17 



