22. Oospore wall reticulate-scrobiculate 23 



22. Oospore wall scrobiculate 24 



23. Oospores 52— 56m— (58) in diameter B. praereticulata 



23. Oospores 58-68/^ in diameter B. gigantea 



24. Oogonia 52-59-(60)/x in diameter, 42-51^ long; dwarf 



male stipe 32-44/i long B. crassa 



24. Oogonia (59)-60-70/oi in diameter, 48-56^ long; dwarf 



male stipe 23-29m long .. B. valida 



25. Vegetative cells lO-lQ/u, in diameter (division of suffultory cell 



usually inferior); oogonia 36-43m in diameter B. Furberae 



25. Vegetative cells larger; division of suffultory cell median or 

 inframedian; oogonia larger — . -— 26 



26. Plants idioandrosporous _. B. congener 



26. Plants gynandrosporous - - 27 



27. Oospore wall crenulate to crenulate-scrobiculate B. crenulata 



27. Oospore wall coarsely scrobiculate B. intermedia 



28. Plants gynandrosporous 30 



28. Plants idioandrosporous. — 29 



29. Vegetative cells 15-20,u. in diameter; oospores 



(37) -44m in diameter - - - - B. pohjandria 



29. Vegetative cells 22-27/u in diameter; oospores 



58-7 6At in diameter B. crassiuscula 



30. Oospores 34-54-(60)m in diameter..-. 31 



30. Oospores 67-90^ in diameter...... .34 



31. Oogonia 42-51/a long .. 32 



31. Oogonia 29-40^1 long 33 



32. Oogonia depressed-globose, 44-56ai in diameter, 



42-51ai long ..... — B. dispar 



32. Oogonia globose or quadrangular-globose, 51-56|U in 



diameter, 44-50^ long B. sessilis 



33. Vegetative cells elongate,' up to 5 times the diameter in length; 



oogonia depressed-globose ..— B. Nordstedtii 



33. Vegetative cells short, as long as broad or up to twice the 



diameter in length; oogonia subdepressed-globose B. borealis 



34. Oogonia 56-65^ long B. setigera 



34. Oogonia 70-88ai long ..... B. alabamensis 



Bulbochaete alabamensis Transeau & Brown in Tiffany 1928, p. 142 



PI. 25, Figs. 1-2 



Nannandrous; gynandrosporous. Vegetative cells elongate, (22)- 

 25.9-(40)/x in diameter, (62)-92.5-(lll)/x long. Oogonia globose 

 or depressed-globose, (74) -77-92^ in diameter, (68) -78.4- (88)/. 

 long. Oospores depressed-globose, outer spore wall areolate, (70)- 

 75-90/x in diameter, (62.9)-68-86/x long. Male filaments scattered 

 on vegetative cells; 14.8ju, in diameter, 29.6/x long. Antheridium 14.8/a 

 in diameter, 14.8/* long. Division of suffultory cell superior. 



Attached to grass in a ditch running through a Sphagnum bog. 

 Wis. 



[147] 



