A Synopsis of Plant Phyla 15 



Family 9. Desmarestiaceae. Plants filamentous above, paren- 

 chymatous below, with a subterminal meristematic region, 

 copiously branched. The unilocular sporangia arise below the 

 growing region. Desmarcstia. (Pf. I, 2, 209.) 



Family 10. Dictyosiphonaceae. Plants parenchymatous, of two 

 layers of cells, branched, growing by an apical cell, and attached 

 below by a dense mass of rhizoids. Only unilocular sporangia are 

 known. Dictyosiphon. (Pf. I, 2, 212.) 



Family 11. Elachistaceae. Plants minute, filamentous or pul- 

 vinate, mostly epiphytic ; both luiilocular and multilocular spo- 

 rangia are present. Elachista, Halothrix. (Pf. I, 2, 216.) 



Family 12. Chordariaceae. Plants mostly minute, pulvinate or 

 filamentous, slimy, growing region subterminal ; both unilocular 

 and multilocular sporangia are present. Myrionema, Chordaria. 

 (Pf. I, 2, 221.) 



Family 13. Stilophoraceae. Plants filiform, consisting of a cen- 

 tral row of cells surrounded by a mantle of parenchymatous ceils ; 

 both unilocular and multilocular sporangia are present. Stilo- 

 pliora. (Pf. 1, 2, 230,) 



Family 14. Spermatochnaceae. Plants filiform, consisting of a 

 central strand of cells surrounded by a mantle of parenchymatous 

 cells. Only unilocular sporangia are known. Spermatochnus. 

 (Pf. I, 2, 233.) 



Family 15. Sporochnaceae. Plants medium sized, branched, 

 composed of united filaments, the branches terminating in tufts 

 of hairs, at whose bases are the growing regions. Sporochnus. 

 (Pf. I, 2, 236.) 



Family 16. Laminariaceae. Plants large, massive, usually con- 

 sisting of a stalk, rooted below and bearing one or more leaves 

 above; unilocular sporangia only are known; these are borne 

 superficially in sori on the leaves. Chorda, Alaria, Laminaria, 

 Costaria, Lessonia, Postclsia, Nercocystis, Macrocystis. (Pf. I, 

 2, 242.) 



Order Cutleriales (Gynocratae). Reproductive cells 

 unlike ; zoospores medium sized, sperms small, eggs large, all 

 biciliated and motile. 



