Key to the Species 

 1. Plants monoecious B. mirabilis 



1. Plants dioecious ( nannandrous ) 2 



2. Wall of oospore smooth 3 



2. Wall of oospore scrobiculate, areolate, or 



longitudinally ridged with costae.. 7 



3. Vegetative cells 21-27 /x in diameter B. obliqv.a 



3. Vegetative cells smaller 4 



4. Division of suffultory cell superior (oospores 



sometimes finely scrobiculate) B. Nordstedtii 



4. Division of suffultory cell lacking or, if 



present, supramedian or basal — o 



5. Suffultory cell without division B. minuta 



5. Suffultory cell division supramedian or basal 6 



6. Division of suffultory cell basal B. elatior 



6. Division of sufFultory cell supramedian B. angulosa 



7. Oospore wall longitudinally ridged with costae — - — - 8 



7. Oospore wall with scrobiculations 17 



8. Suffultory cell without division B. pygmaea 



8. Suffultory cell with superior (supreme) division.— 9 



9. Oospores 42-61m in diameter 10 



9. Oospores smaller — 12 



10. Oospores 54-6 1/^ in diameter B. regalis 



10. Oospores smaller 11 



11. Oospores with toothed costae which have interconnecting transverse 

 ridges between the teeth ( reticulate-costate ) B. reticulata 



11. Oospores with longitudinal coarsely-toothed costae -— B. insignis 



12. Oospores 20-24fi in diameter .... B. tenuis 



12. Oospores larger 13 



13. Vegetative cells repand - - B. repanda 



13. Vegetative cells nearly cylindrical (not repand) 14 



14. Oogonia ovoid .. — 15 



14. Oogonia ellipsoid — 16 



15. Oogonia 59-69^ long B. minor 



15. Oogonia 44-54/x long B. varians 



16. Oogonia 32-39/i in diameter .-. - B. rectangularis 



16. Oogonia 28-32-(33)ai in diameter B. hiloensis 



17. Division of suffultory cell inferior or basal — - 18 



17. Division of suffultory cell median or superior to supreme 20 



18. Division of suffultory cell basal 19 



18. Division of suffultory cell inferior .__... ..-B. Furberae 



19. Vegetative cells 13-16m in diameter; oospores 26-42ju. 



in diameter, minutely scrobiculate ..- B. scrobiculate 



19. Vegetative cells 17-20/x in diameter; oospores 



40-48/x in diameter, scrobiculate B. Brebissonii 



20. Division of suffultory cell median or inframedian 21 



20. Division of suffultory cell superior to supreme - 28 



21. Oospore 52-68/ii in diameter 22 



21. Oospore smaller — - 25 



[146] 



