228 Chaetophoraceae 



VIII. CHAETOSPHAERIDIUM Klebahn, Jahrb. wiss. Bot. 

 24: 276. 1892; 25: 306. 1893* 



Thallus microscopic, epiphytic on filamentous algae ; cells 

 joined in a short filament by means of empty cylindrical utricles, 

 or in a loose aggregation held together by a gelatinous invest- 

 ment. Cells flask-shaped, composed of a globose basal portion 

 produced into a narrow cylindrical or conical summit which forms 

 a basal sheath for a very long and delicate, flagelliform, persistent 

 seta. Chromatophore a parietal layer, carrying a pyrenoid. 

 Division of the cells horizontal, the lower of the daughter-cells 

 migrating to the side. 



Reproduction by means of zoospores, formed to the number of 

 4 or more (?) in any cell. 



Inhabitants of fresh water. Type C. Pringsheiviii Klebahn. 

 [Etym. %airij % hair, and aipacp'tocov, a little sphere.] 



1. Chaetosphaeridium Pringsheimii Klebahn, Jahrb. wiss. Bot. 



24: 276.pi.4-. 1892; 25: 307. //. 14. f. it: 1893. Moebius, 



Flora, 75: 433. 1892. DeWild. Flor. Buitenz. 3 : 60. 1900. 



AphanocJiaete globosa Moebius, Biol. Centralb. 12: 105. f.8. 1892. 



Thallus composed of 3-18 cells loosely joined into filaments, or 

 with the connecting utricles well developed ; cells at the base 

 globose, 9-12 fi in diameter ; sheath 1.5-2 ju in diameter, 10-12/i 

 long (13-18/^, Klebahn); seta flagelliform, often 200-300/-/ long 

 {pi. 42J.3, 4). 



Creeping on Oedogoniian, Greenwood Lake, New Jersey, Sep- 

 tember (467). 



In the general character of the cells our specimens agree very 

 closely with Klebahn's description. The utricles, mentioned by 

 this author as a prominent character are hardly distinguishable, so 

 that possibly our specimens should be considered his forma con- 

 ferta. In one case only there appeared to be an investment of 

 mucus (shown in our figure). The divergences from C. Pring- 

 sheimii do not seem sufficient to warrant establishing a new species. 



2. Chaetosphaeridium globosum (Nordst.) Klebahn, Jahrb. 



wiss. Bot. 25 : 306. //. 14. f. 5-10. 1893 ; Bot. Centralb. 56 : 

 323-326. 1893. 



Hcrposteiron globosa Nordst. Alg. ex Ins. Sandvic. 23. pi. 2. f. 

 22, 23. 1878. 



* Reported in advanced of publication, Ber. Deutsch. bot. Gesell. 9 : (7). 1891. 



