188 Chaetophoraceae 



moved from this family and placed with the Pleurococcaceae, be- 

 cause of the absence of reproduction by zoospores. 



Schizomeris Kiitz. (Phyc. Gen. 247. 1843). We cannot accept 

 the view of Professor Wille ('90) who disposes of this genus by 

 placing it among the synonyms of Ulothrix. We have found 

 Schizomeris Leibleinii Kiitz. growing abundantly in a watering- 

 trough and also in bright green Spirogyra-like masses at the 

 edges of a creek near Long Branch, New Jersey, in midsummer, 

 a time when all similar Ulothrix forms had disappeared. Although 

 certain young filaments were almost indistinguishable from Ulothrix 

 sonata, yet in all larger filaments the characteristic brick-like ar- 

 rangement of the cells was very different from anything ordinarily 

 found in Ulothrix. Most striking, however, was the manner of 

 dispersal of the zoospores ; all the dissepiments in the upper part 

 of the thallus appeared to be softened or broken down, and the 

 masses of zoospores escaped through the open funnel formed by 

 the outer cell-wall. We have little question in regard to the 

 validity of the genus Schizomeris, but as its affinity seems to be 

 with the Ulvaceae rather more than with the Ulothricaceae, further 

 treatment of it is reserved for another place. 



Gloeotila Kiitz. (Phyc. Gen. 245. 1 843). Under this name have 

 been placed various forms having affinities with Ulothrix and Sticho- 

 coccus, some of which, because of insufficient characterization, can- 

 not be determined with any certainty. Kiitzing's type of this genus 

 was G. oscillarina {Conferva oscillatorioidcs Kiitz. Alg. Dec). This 

 species was finally removed by its author to Stigeoclonium as 5. 

 sctigerum, so that the genus Gloeotila must be abandoned. 



Family CHAETOPHORACEAE 



The thallus consists of a simple or more often branched fila- 

 ment, composed normally of a single series of uninucleate cells, 

 which may all be of equal value, or some may be specialized as 

 supporting or terminal structures and others as potential repro- 

 ductive structures. The chromatophore in each vegetative cell 

 is band-shaped, or it more or less completely lines the whole 

 cell-wall, and generally contains one to many pyrenoids. Asex- 

 ual reproduction by means of zoospores, akinetes or aplanospores. 



