66 THE FLORA OF NEBRASKA. 



Cladophora glomerata (L.) Kuetz. Phyc. Germ. 212. 1845. 

 Conferva glomerata L. Spec. PL 1157. 1753. 



Branches not connate at base; branches of the second and third order 

 fasciculate; cell-contents reticulate, attached to the cell-wall; cell- wall 

 smooth; fruiting cell always terminal; cells of the stem, 55-100 (i in 

 diam., of the branches, 30-55 <«. 

 Very common and very variable; found in fresh and brackish water through- 

 out the state. PL XX., Figs, a, b, c. 



Cladophora canal icularis (Roth.) Kuetz. Phyc. Germ. 214. 1845. 

 Conferva canalicularis Roth. Cat. II. 218. 1800. 



Dichotomously, or trichotomously branched; branches connate at base, often 

 fasciculate above; cell-membrane of ten thick; fruiting cell terminal; cells 

 cylindrical 80-110 fi broad, 5-8 times as long, cells of the branches shorter, 

 35-50 fi in diam. 

 In creeks near Lincoln, not common. 



Family.-PITHOPHORACEAE. 



Thallus consisting of two parts; cauloid developed upward from the spore, fertile, 

 mostly branched, the branches arising a little below the top of their supporting cells; 

 rhizoid developed downwards from the spore, mostly sterile, simple, usually unicellular; 

 cells formed by division of the terminal cell; propagation by means of neutral, quiescent 

 spores, formed by the transformation of a whole cell or by the segregation of a part of 

 its plasm. 



1. PITHOPHORA Wittb. Dev. and Syst. Arr. Pith. 47. 1877. 

 Characters of the family. 

 Etymology: Greek, mdog, jug, and <j>opew, bear. 



Pithophora oedogonia (Mont.) Wittb. 1. c. 55. 



Conferva oedogonia Montagne Crypt. Guyan. 301. 1835. 



Slender, elongated; principal filaments of the cauloid part 70 n in diam. in 

 fertile specimens; branches solitary or opposite; spores single or rarely 

 in pairs, terminal, or intercalated; intercalated spores cask-shaped, I14x 

 230 fi; terminal spores cask-shaped, upper end obtusa-conical, 95x215 ,«. 

 In running water, Lincoln and South Bend. PL XVII., Figs. 3, 4. 



Pithophora nlliiiis Nobdst. De Alg. et Char. Scand. 19. 1878. 



Principal filament of the cauloid part 50-85 [i broad in fertile specimens; 



branches sterile, opposite or alternate; spores intercalated or terminal; 



terminal spores short, acuminate; apex rounded or obtuse; intercalated 



spores 103x185 ft. 

 In stagnant water, Greenwood. 



Family.— OEDOGONIACEAE. 



Filaments simple or branched; terminal cell often ending in a long, hyaline seta: 

 basal cell lobed, forming a foot by which the plant is attached; growth intercalary, 

 shown by transverse striae at one end: propagation by zoospores; cell contents escap- 

 ing by rupture of the cell-wall, forming a large, oval, ciliate zoospore; reproduction by 

 oogones and antherids; oogones large, intercalated; antherids small, flask-shaped, borne 

 upon or near the oogones, or sometimes intercalated in the filament. 



