174 NEMATOPHYCE^. 



&. Basal cell of the stem of the male plants longer than the 

 spermogonia. 



B. gigantea, Prinff. 



Sect. 2. Oogonia ellipsoid or snbellipsoid ; oospores of the same form, 

 filling the oogonia, epispore longitudinally costate, costae more or less 

 crenulate. 

 Sub-Sect. 1. Species monoecious. 



B. mirabilis, Wittr. 

 Sub-Sect. 2. Species dioecious. 



A. Dissepiment of supporting cell obsolete. 



B. pygmcea, Pring. 



B. Dissepiment of sup} oriing cell present. 



B. insignis, Prings. 

 B. rectangalaris, Wittr. 



Species of which the organs of fructification are imperfectly known. 

 B. gracilis, Prings. 



SECTION!. Oogonia globose, or subglobose ; dioecious. 



B. Dwarf males biceUular. 

 Bulbochoete intermedia. DeBary CEdog. 72, i. 4, /. 1-7. 



Oogonia somewhat depressedly globose, seated beneath the 

 androsporangia, dissepiment of the supporting cell in the 

 middle ; epispore delicately crenulate (rarely seen) ; andro- 

 sporangia 1-2 celled, epigynous, rarely scattered, dwarf males 

 seated on the oogonia, stem slightly curved. 



SIZE. Cells 017-*019 mm. 1^-3 times as long ; androspore 

 cells -013 X-01 mm. ; oogonia '04--048 X 031--04mm. ; dwarf 

 males -009--01 X -024--026 mm. 



Wittr. Mon. (Edog. p. 44, t. 1, f. 18. Kirch. Alg. Schles. 

 p. 60. Rabh. Alg. Ear. iii, 358. 



Britain, Ireland. 



Plate LXVII. Jig. 1. SulbocJioete intermedia, with oogonia, after 

 DeBary x 400. 



Bulbochoete polyandra. Cleve. Wittr. Disp. p. 140. 



Idio-androsporous. Oogonia sub-depressedly globose, seated 

 beneath terminal setaa or vegetative cells ; dissepiment of sup- 

 porting cell above, or rarely about the middle ; epispore deli- 

 cately crenulate or nearly even ; androsporangia 4-10 celled ; 

 dwarf males seated on the oogonia, stem a little curved. 



SIZE. Cells *015-*02 mm., 3-5 times as long; oogonia 

 035--046 X -032--038 mm. ; androspore cell -013--014 x 

 012--015 mm. ; dwarf males '008--009 X -023 mm. 



Wittr. Mon. (Edog. p. 46, t. 1, f. 19, 20. Kirch. Alg. Schles, 

 p. 61. 



Britain, Ireland. 



Plate LXVII. jig. 2. Bulbochoete polyandra, with oogonia ; 2a, with 

 androsporangia x 400. 



