•23S SO.MK N()\A SCOIIAN AgL'Al'"' KlN'il. MOORE. 



EXI'LAXATIOXS OK FlCLRKS. 



I Tlie luiMibor- in brackets give the approximate liiniar magnification.) 

 Sn prolegnia vionoica Pringsh. Figs. 1-2. 



1. (100) Empty sporangia. 



2. (225) Oogonium. 



Saprolegnia diclina Humpli., Fig. 3. 



3. (225) Oogonium with attached aiitheridia. The connection of these 



witli their filaments of origin is readily :-evered. 



Achhja americana Hump., Fig. 4. 



4. (225) Oogonium witli anlheridial branch and aiitheridia. 



Achlya dcBaryana Humph. ^.1. polyandra doBavy. Figs. 5-8. 



5. (225) Empty sporangium, young culture. 



6. (100) Two filaments with oogonia and anthcridial branch. The 



production of an oogonium at the base of an antheridial 

 branch as here figured is very rare. (6) A ripe ecentric 

 oospore. 



7. (225) Oogonium witli young oospores and anthoridia. 



8. (225) Oogonium with much coiled antheridial branch. 



Achlya pohjandra Hildeb., Fig. 9. 



9. (225) Typical oogonium with antheridial branches and antheridia. 



The antheridial branches in this ca"^' take their origin in 

 part from the oogonial branch and in ])art from other 

 filaments. 



Achlya apvcnlata deBary, Figs. 10-1:1. 



10. (50) Empty sporangia from vigorous culture. 



11. (225) Oogonium with antheridial branch and antheridia. No 



apiculus on oogonium. 



12. (225) Typical oogonium — antheridia omitted. 



13. (225) A rare intercalary oogonium. 



Achlya raccmosa Hildeb., Fig. 14. 



14. (225) Oogonium with antheridia. 



Achlya raccmosa var. fitrUuicrn Cornu.. Fig. 15. 



15. (225) Oogonium with antheridia. 



Achlya acadiensis sp. nov.. Figs. Ifi-lO. / 



16. (100) Sporangium with encysted 7.nns])ores. 



17. (225) An intercalary oogonium. 



18. (225) Terminal oogonium. 



19. (225) A j)ortion of the wall of an cogoiiiuiti. 



Aphanomyccs stellatus deBary, Fig. 2lt. 



20. (225) Oogonium with oospore. 



Leptomitus lacteus Agardh. Figs. 21 and 22. 

 A })ortion of a liypha shewing method of branching and 



cellulin graTUiles. 

 A terminal sporangium with zoospores encysted within it. 



Hapromyccn sp. Figs. 23 and 24. 

 Hypha) shewing method of branching and formation of 



sporangia. 

 Empty sporangium nith throe r-MV-tcd zoospores. 



21. 



(225) 



22. 



(225) 



23. 



(100) 



24. 



(225) 



