415 



C. fasciculata (pseudo-iauiified filaments with intercalary heterocysts) as 

 separate species; for although the extreme points of the scale of forms 

 of this species may seem to have their characters well defined, in 

 reality they are evenly allied 1o eacli other through intermediate forms. 

 Thus one may find unramified filaments with only hasal heterocysts 

 but also with a few or even many intercalary ones, and in ramified 

 filaments the number of intercalary heterocyts will vary from to 

 many. Hence in many cases o"ne should be obliged to refer a cer- 

 tain form to either the one or the other of the two Bornet it- Fla- 

 hault's species even though it does not quite agree with either the 

 special characters of the first one or of the second of those two species. 

 Because of the beforesaid I have preferred to unite C. Hcopulornm 

 and C. fasciculata into one species: C. scopulorum (Weber ct' Mohr) 

 Agardh emend, containing all continous forms of the two , species" 

 and limited by the species- description above'). We may distinguish 

 between the following though rather often badly characterized forms: 

 f. simplex with unramified, f. subsimplex with slightly, and f. ramosa 

 with greatly ramified filaments. It must be said, that those bunches 

 or bundles of , branches" often found on ^C. fasciculata'^ are not al- 

 ways due to ramifications of the filament on wich they are placed, but 

 often to the development of hormogonies, which have placed themselves 

 there and have grown into piliferous bundles of filaments. " 



113. Gloiotricliia natans fHedw.) Rabenhorst. 



Deutschlands Kryptogamen-Flora, p. 90, 1847. 



var. a, genuina. 



Sporis in parte inferior! latioribus qvam in parte superiori. 



var. y?, aeqvalis Nob. 



Sporis longissimis, cylindricis, per totam longitudinem aeqvi- 

 crassis. 



1 1 4. ^lastigocoleiis testariim Lagerheim. 



Note sur le M., nouveau genre des Algues marines de I'ordre 

 des Phycochromacees, Notarisia, 1, p. 65, 1886. 



var. a, genuina. 



Thallo immerso glauco vel pallide aerugineo. Trichomatibus 

 eodem colore. Articulis saepius cylindricis vel subcylindricis. 



var. p*. rosea Nob. 



Thallo immerso roseo vel lilaceo, maculas orbiculares 

 demmii confluentes efficiente. Trichomatibus pm'pureo - roseis vel 

 purpureo-violaceis. Articulis saepe irregulariter inflatis. 



') Perhaps Calotlirix crusiacea Thuret, which I know only from 

 Bornet &: Flahault's descriptions, belongs to the widened C. scopu- 

 lorum. But future examinations must settle this point. 



