62 ATLAS DEUTSCHE!? MEEKESALGEN. 



of the vertical filaments, while the plurilocular are formed higher 

 up on the same filaments, by the transverse elongation and 

 septation of certain of their cells. 



Three plates are devoted to Desmotrichum Kutz. One species, 

 D. scopulorum , is new. 



The specific value of the form Scytosiphon pyymmis Eke. (plate 

 14), seems to be doubtful. 



Ascocycius Magn. is a genus connecting Ectocarpus with Myrionema, 

 and its species have hitherto been placed in one or other of the 

 latter genera. This genus, though founded so long ago as 1874, 

 is not given among the synonyms in Hauck. Five species are here 

 described and figured, of which two are new. 



Of Ectocarpus, four species are given, one of which, E. repens 

 Eke., is new, and connects this genus with Ascocycius. It should 

 be mentioned that Dr. Eeinke defines Ectocarpus, so as to include 

 both Streblonema Derb. et Sol., and Pilayella, Bory. 



As regards the Phaaosporeae generally, the author after separating 

 the Cutleriaceae, Tilopterideae, and Larninariaceae, unites all the 

 rest into a single family the Ectocarpaceae, which group themselves 

 about the genus Ectocarpus. He has found it impossible to break 

 up this great family without resorting to minute and artificial 

 divisions. The Ectocarpacese are, it is true, arranged in groups 

 for convenience, but these groups merge into one another. On 

 page 87 of the ' Algenflora ' a scheme of the relationships of the 

 various Ectocarpaceous genera is given. 



Of the Florideae only two are figured in this part. Rhodochorton 

 chantransioides Eke. is a new species, remarkable for its very long, 

 spiral chromatophores. A Baltic form of Antithamnion boreale, 

 Gobi, is also included. 



There are one or two points of interest among the few Chloro- 

 phyceae given. Blastophysa rhizopus Eke. is a very curious plant, 

 bearing a certain general resemblance to some stages of Botrydium, 

 but not known for certain to form zoospores. Its reproduction, so 

 far as is known, is by vegetative division simply. 



Cladophora pygmcea Eke. is a new, and apparently insignificant 

 species of that enormous genus. 



Epicladia Flustra Eke. is the type of a new confervaceous genus, 

 possibly not distinct from Entocladia, already established by the 

 author. It consists of much branched filaments, adherent to the 

 surface of the Flustra, and cohering to form a pseudoparenchy- 

 niatous disc. The reproduction is by zoospores formed in abund- 

 ance in each cell. It will be remembered that Entocladia Eke. 

 grows in the thickness of the cell-wall of various Algae. 



Pringsheimia scutata Eke. represents a new genus, doubtfully 

 referred to the Ulvaceas, with which it seems to have very little 

 in common. In habit it resembles a Coleochaete, but has no bristles. 

 It is epiphytic on various Algae and has a marginal growth, its cells 

 branching, and then dividing. Eeproduction is of two kinds. 

 1. Asexual. Here a few biciliate macrozoospores are formed in 

 each of the more central cells of the thallus. They escape by a 

 crevice in the cell-wall. 2. Sexual. Here a larger number of 



