Till, i i.oi: \ I »] \i:i',i: KSE \. ] - . 



Class VI.— KHODOPHYCEAE. 



Thallus simple, or of branched filaments, or Leaf Like or bushy in growth, Bfa 

 more or less differentiation of cells into tissues; chlorophyll usuallj 

 shade of red; carpogone as in Coleochaet* consisting of a cell with an upward 

 tion (trichogyne), but closed al the top; antherids produced singly or in clusters on the 

 ends of branches; antherozoids without cilia Asexual reproduction by non-motil< 

 tetragonidia (tetraspores) formed on certain branches or on any part of the plant body, 

 but not usually found on sexual plants. 



After fertilization, in the sun pi it tonus (Bangiacecu . the contents of the 

 divide into eight parts which escape immediately as globular amoeboid cells and 



time come to rest, develop a cell wall, and germinate. Ln the higher families t h intents 



of the carpogone do not divide ami escape after fertilization, bul push out as Lateral 

 protuberances which are cut off as separate spores having the ; erminate im 



mediately. There are also other groups of this das-, in which the formation of the 

 carpospore is much more complex. In most cases alter fertilization a coating of ••ell- 

 grows up from below the carpogone surrounding it as in CoZ oehaete. It will be seen thai 

 the reproduction of the lower forms differs only slightly from thai of the Oedog 

 and Coleochaetaceae, to which they are evidently closely related. 



There is but one order. 



Order 19.— FLORIDEAE.— The characters of the class. Mostly marine, but 



species widely distributed in fresh water. 

 But one family is represented in our limits. 



Family.- NEMALIACEAE. 



Plant-body gelatinous, composed of an axial, branched, articulate filament, 

 surrounded with a cortex of similar filaments, with horizontal, corymbose, or verticillate 

 branches on which are borne the antherids and carpogones. 



SYNOPSIS. 



Axial filament covered with a loose corticatiou of similar filaments.. . . Batrachospt rmum 

 Filaments not corticated ChanU 



1. BATRACHOSPERHLMI Hot,,. Fl. Germ. 111. L50. L800. 



Axial filament surrounded by a cortex of similar parallel filaments, clothed 

 with subglobose whorls of branchlets on t he ends of w hich are borne the 

 carpogones and antherids. 



Etymology: Greek, /?«r/j«A r <<;, frog, and . set I. 



Batrachospermiim gelatinosum (L.) A. F. Woods Rep Bot. Surv. Neb. III. 

 G. 1894. 

 Conferva gelatinosa Linnb Spec. PI. 1166. 1753. 

 Batrachospermum moniliforme Roth 1. c. 



Plants 5-2() cm. long, l 2 mm. broad, gelatinous, dark purplish-green; main 

 stems and branches composed of an axial, articulate filament 001 

 with a loose coat (cortication) of similar filaments from whioh ai 

 more or less regular intervals dense globular whorls of moniliform, 

 dichotomously divided branchlets. 

 In springs, Bellevue. 



