8 Charles E. Bcssey 



generation isog-amic, the gametes biciliated. Draparnaldia, Chae- 

 iophora. (Pf. I, 2, 86.) 



Family 11. Microthamniaceae. Filaments with scarcely at- 

 tenuated multicellular branches without hairs; chromatophore a 

 single parietal plate containing one or more pyrenoids ; propaga- 

 tion by biciliated or quadriciliated zoospores ; generation isoga- 

 mic, the gametes biciliated. Microthainnion. (Pf. I, 2, 97.) 



Family 12. Trentopohliaceae. Filaments with scarcely atten- 

 uated multicellular branches, without hairs ; chromatophores sev- 

 eral, parietal, disc-like, without pyrenoids ; propagation by bicili- 

 ated zoospores ; generation isogamic, the gametes biciliated ; both 

 zoospores and gametes are produced in special lateral cells, Trcn- 

 topohlia. (Pf. I, 2, 99.) 



Family 13. Herposteiraceae. Filaments with scarcely attenu- 

 ated multicellular branches, bearing lateral unicellular hairs; 

 chromatophore a single parietal plate containing a pyrenoid; 

 propagation by quadriciliated zoospores ; generation heterogamic, 

 the gametes quadriciliated and free swimming. Herposteiron. 



(Pf. I, 2, 94.) _ 



Family 14. Cylindrocapsaceae. Filaments unbranched ; chrom- 

 atophore a single parietal plate with a pyrenoid ; propagation 

 by biciliated zoospores ; generation heterogamic, the sperms bi- 

 ciliated, the Qgg non-ciliated remaining in the oogone. Cylin- 

 drocapsa. (Pf. I, 2, 106.) 



Family 15. Oedogoniaceae. Filaments simple or branched, 

 sometimes bristle-bearing, chromatophore a single parietal plate 

 with one or more pyrenoids ; propagation by multiciliated zoo- 

 spores ; generation heterogamic, the sperms multiciliated, the Q^g 

 non-ciliated and remaining in the oogone. Ocdogoniiim, Btd- 

 hochactc. (Pf. I, 2, 108.) 



Family 16. Monoblepharidaceae. Filaments simple or 

 branched, septate above, tubular below, colorless ; propagation by 

 uniciliated zoospores ; generation heterogamic, the sperms unicili- 

 ated, the eggs non-ciliated, and remaining in the oogone. Small, 

 saprophytic aquatic fungi. Monoblcpliaris. (Pf. I, i, 106.) 



Order Coleochaetales. Filaments branched, usually fusing 

 laterally into rounded or irregular discs; chromatophore one, 



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