1896.] Aquatic Fungi. 329 
Oogonia 50-6oz. Oospores 3 5-454. Peripheral cells about 
7X tO. 
On submerged sticks in ponds and ditches, vicinity of Cam- 
bridge, Mass., and of Kittery Point, Maine. 
This strikingly beautiful form is very common in the vicin- 
ity of Cambridge and may be found in abundance at almost 
any time during the late spring and summer. It is subject 
toconsiderable variation as regards the relative development 
of the basal cell and of the filaments arising from it. In 
some cases the latter are branched not more than once or 
twice as is represented in fig. 20, and in such instances the 
oogonia greatly outnumber the sporangia. In other cases 
the filaments are far more highly developed being many times 
successively branched, the branches growing more slender 
and usually longer as they are successively formed, and bear- 
mg many more zoosporangia than oogonia. It is in such 
individuals that the spinose sporangia most frequently occur 
and often greatly outnumber these of the ordinary type. The 
cellular envelop of the oospores remains about them after the 
Sgonium wall has disappeared, and may be seen to consist 
f distinct cells. The latter are slightly inflated and the 
Wall of the oospore follows the contour of their inner margins. 
The Species seems to differ from the Rhipidium spinosum of 
Cornu from the different shape of its sporangia and from the 
fact that in the spinose form the spines are radiate and not 
directed “en haut ou en bas.”!5 Nevertheless the species, 
like the Rhipidium just described, may yet prove synony- 
Tous with the European form. 
Sipromyces androgynus, nov. sp.—Plate XXII, figs. 10-19. 
Like S, Reinschii though somewhat smaller. The oogonia 
Piriform, Sometimes encrusted by a blackish scaly deposit. 
Oospores spherical, the thick colorless wall more or less mod- 
ited by the Presence of elevations which sometimes give it 
*Toughly undulate outline. Antheridial branches arising we 
othe base of the oogonium from the same segment, . He 
: Ist Usually present below the antheridium which app Je 
si ® the apex of the oogonium and is similar in hie ul 
sees = Reinschit. Total length PSE aa ie 
20-26, ut 75x 264. Oogonia 27-30 3 
*’Comy Mo 
, nograph 15. 
