OBDBBfl and OBNEBA. 9 



irminal, Lnvolucrated, containing tufts of pear- 

 Bhaped spores. Tetraspores Bessile, scattered. 



LXXXVT. Sbibospoba. "Frond articulated. Tetraspores 

 disposed in terminal, moniliform strings. 



LXXXVII. Callith amnion. Frond (at leasi the branches 

 and rarauli) articulate, mostly pinnate. Favelke ter- 

 minal or lateral, sessile, without involucre (excepi in 

 c. Tumeri). Tetraspores sessile or pedicellate, scat- 

 tered. 



Sub-class ITL CHLOEOSPEBME^ ob CONFEE- 



valks. 



(Grass-green* Seaweeds.) 



Order 1 l. Siphonaceje. Green, marine or freshrwater Algce, 

 composed of continuous, tubular, simple or branched fila- 

 ments (elongated cylindrical cells), free, or variously com- 

 bined in cylindrical or expanded fronds. 

 LXWVI1I. Codium. Filaments combined into a spongy 



frond. 

 LXXXIX. Bbyopsis. Filaments free, pinnated. 

 XO. Vauchebia. Filaments ivec. dichotomous or irregular. 



Order 15. Confkkv uri:. Green, marine or fresh-water Algce, 

 composed of articulated filaments, simple or branch*, 

 or invested by gelatine. Celts cylindrical, truncate. 

 Sub-order 1. Con febv i;.i:. Filaments free, destitute qfgelatim . 

 Wl. Cladophoba. Filaments tufted, branched. 

 XCII. Rhizoclonium. Filaments decumbent, subsimple, 



emitting a few root-like branches. 

 XCHI. Confbbva. Filaments unbranched. 

 Sub-order '1. Ch etophobe e. Filaments united in submembra- 

 ms or gelatinous fronds ; cells often tipped with bris- 

 tles. Sporangia external. 

 XCIV. OCHLOCHJETB. Fraud disciform. Filaments ra- 



diating Prom a central point, prostrate, irregularly 

 branched ; each * ■ t ^ i 1 produced above into a rigid, inar- 

 ticulate bristle. 



Order 16. Dlvaceje. G arety purple, marine or 



iter Alga, composed of smalt polygonal cells, forming 

 expanded membranes, or membranous tubes; very 

 arranged in filaments. 

 \i V noBPB \. Frond tubular. 



A k w Ulvacea and OsciUatoriaoees are purple. 



