A PLANES 79 



(fig. 8, p. 556) showing two long oogonia, one apical and one intercalary, 

 each with long anthoriclia wrapped about it. He found the plant after 

 it was a little old and was not able to follow the beha\ior of the spores, 

 but his preparations showed a few sporangia. These w^ere like those de- 

 scribed by deBary with spores sprouting into threads from within the 

 sporangium. He did not observe dictiosporangia. It may be, of course, 

 that there are two forms of this species differing from each other in the 

 beha\ior of the spores. 



2. Aplanes Treleaseanus (Humphrey) n. comb. 



Saprolegnia Treleaseana Humphrey. Trans. Am. Phil. Soc. 17: in, 



pi. 17, figs. 56-59. 1892 [1893I. 

 Saprolegiiia sp. 2 Reinsch. Jahrb. f. wiss. Bot. 11: 295, pi. 14, figs. 



7, 8, II, 12, 13. 1878. 

 Saprolegiiia paradoxa Petersen. Bot. Tidssk. 29: 379. 1909; also 



Ann. Myc. 8: 520, fig. i d and e. 1910. 

 Not S. paradoxa JNIaurizio. Mitt. d. Deutsch. Fischerei-Vereins 7, 



heft 2: 46. 1899. 

 Saprolegiiia monoica \'ar. tiirfosa Minden. Krypt. P'lora Mark 



Brandenburg 5: 516. 1912. 



Saprolegiiia tnrfosa (Minden) Gaumann. Botaniska Xotiser, 1918, 



P- 154- 

 Aclilya Treleaseana (Humph.) Kauffman. Ann. Rept. Mich. Acad. 



Sci. 8: 27. 1905. 



Plate 20 



Growth moderately stout, threads about i5-25fj. thick; sporangia 

 very scarce, usually entirely absent, cylindrical, rounded at the tip, 

 proliferating internally in the few we have seen; spores about iiix in 

 diameter. Gemmae fairly plentiful (not nearly so abundant as in S. 

 liloralis), the great majority rod-shaped and in chains exactly as in Achlya 

 deBaryana, only here and there one fusiform or oval, etc. Oogonia 

 spherical (without a neck), or rarely oblong or pyriform, smooth or at 

 times papillate-warted, 27-90;! in diameter, nearly always racemosely 

 borne on short stalks (no intercalary or cylindrical ones seen) ; wall 

 hyaline, varying in thickness with the size of the oogonia; in small ones 

 as little as i.2j. thick, in large ones thicker than in any species of Sapro- 

 legiiia or Achlya, and reaching up to 4^1.; pits numerous and very conspicuous 

 (few and less conspicuous in small oogonia). Eggs 1-30, mostly 6-20 in 

 an oogonium, 20-26;;. thick, often elliptic or block-shaped from pressure, 

 and usually well filling or even crowding the oogonium, centric; wall 

 thick. Antheridia on all the oogonia, very peculiar, arising from short 

 stalks which spring laterally from immediately beneath the oogonia, an 

 antheridial cell not being cut off from the oogonial stalk except in very 

 few cases; tubes from the partition wall into the oogonium lacking. The 

 whole of the antheridial thread may be cut off as an antheridium or only 

 a part of it; at times also no wall cutting off an antheridium can be seen. 



