Revisions of Some Plant Phyla 9 



Family 5. Helminthocladiaceae. Plants filamentous, simple or 

 parenchymatous, variously branched, usually slimy and sometimes 

 encrusted with lime; mostly marine. Batrachospennum (in fresh 

 water), Nemalion, Liagora. (Pf. I, 2, 2>^7-) 



Family 6. Thoreaceae. Plants erect, filamentous, simple or 

 branched, covered with parallel hairs, living in fresh water. 

 Thorea is the only genus. (Pf. I, 2, 321.) 



Family 7. Chaetangiaceae. Plants varying from dichoto- 

 mously branching, rounded stems to more or less flattened, mass- 

 ive, leaf-like structures ; all marine. Chactangiiim. (Pf. I, 2, 

 325-) 



Family 8. Gelidiaceae. Plants ranging from minute epiphytes 

 to slender and gracefully branched forms, and stout branched 

 parenchymatous masses, all marine, and a few species (of Chore- 

 ocolax) parasitic and colorless. Wrangelia, Gelidium. (Pf. I, 

 2, 340.) 



Order Cryptonemiales. Hard Red Seaweeds. Plants fili- 

 form, branched, often complanate; oogones and auxiliary cells 

 separated; the fertilized egg conjugates with the remote auxiliary 

 cell by means of its long branching filament (" ooblastema ") ; the 

 auxiliary cell then gives rise to the sporophores. 



Family 9. Gloiosiphoniaceae. Plants terete or complanate, 

 forked or laterally branched, more or less filamentous internally. 

 Gloiosiphonia, Gloiopeltis. (Pf. I, 2, 505.) 



Family 10. Grateloupiaceae. Plants terete or angled, com- 

 planate or foliaceous, variously forked, or more commonly later- 

 ally branched, more or less filamentous internally, Halymenia, 

 Grateloupia, Cryptonemia. (Pf. I, 2, 508.) 



Family 11. Dumontiaceae. Plants terete, complanate, or foli- 

 aceous, forked or laterally branched, more or less tubular inter- 

 nally. Dumontia, Diidresnaya. (Pf. I, 2, 515.) 



Family 12. Nemastomacae. Plants terete, complanate, or foli- 

 aceous, variously forked or laterally branched, more or less fila- 

 mentous internally. Schizymenia^ Nemastoma. (Pf. I, 2, 521.) 



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