302 
Mycologia 
Explanation of Plates CXLVI-CXLVIII 
All drawings were made with the aid of the camera lucida. 
Plate CXLVI 
Achlya paradoxa sp. nov. 
1. A group of empty sporangia of normal appearance. X 335. 
2. A group of sporangia showing both lateral and internal proliferation. 
X 335 . 
3. Another example of the above. X 335. 
4. A sporangium with spores killed during exit, showing the cilia. X 335. 
5. An oogonium with base intercalated in a hypha. The projection below 
is not usual. An antheridium was present, but is not shown. X 335. 
6. 7 and 8. Typical oogonia with antheridia. X 335. 
9 and 10. Chlamydospores. X 335. 
Plate CXLVII 
Pythiopsis cymosa De Bary 
1. Oogonium with a typical sub-basal antheridium. X 720. 
2. Ditto, with an additional lateral antheridium. X 72 o. 
3. Ditto, with two sub-basal antheridia. X 720. 
4. 5, 6 and 7. Oogonia of various forms with antheridia of various origin. 
X 720. 
8. An abnormal double oogonium, apparently without an antheridium. X 720. 
9. Sporangia of typical shapes. X 447- 
10. Sporangia about one minute before discharge showing the spores in 
the compression stage. X 447. 
Chlamydospores ; one having discharged spores by a basal papilla. X 447. 
12. Spores, killed while swimming; one with four cilia and double size. 
X 720 - 
Plate CXLVIII 
Pythiopsis Humphreyana sp. nov. 
1. Sporangia of the globular form. X 335. 
2. Two sporangia with an oogonium and antheridium. X 335. 
3> 4 > 5. 6, 7, 8, 9 and 10. Sporangia of various forms. Nos. 3 and 4 X 185 ; 
others X 125. 
11. A sporangium, surrounded with several oogonia. X 185. 
12. Two sporangia, with oogonia in close proximity. X 185. 
13. A young oogonium with antheridium. X 335- 
14. An oogonium with two eggs and two antheridia, one of which is dicli- 
nous. X 335 - 
15. Another oogonium with a diclinous antheridium, showing plainly the 
antheridial tube. X 335. 
16. An abnormal oogonium with four eggs. X 335. 
