WITH NOTES ON OTHER SPECIES. 123 



spring, and the other from a few Ulotlirichaceoe taken from an open cask sunk in the 

 soil of a pasture and apparently filled only by rains. It does not seem to be com- 

 mon. The species is readily recognized by the very characteristic antheridia, which 

 are quite unlike those of any other species. The color of the old otigonial wall and 

 its irregular thickening are also constant features. At the points of application of 

 the antheridia hardly any secondary thickening occurs, so that it remains thin there. 

 There can be no doubt that Hildebrand's A. lignicola is merely a depauperate 

 form of the present species, probably due in part to its growth on vegetable remains. 

 There seems to be no reason for giving it even varietal rank. But we may distin- 

 guish clearly the 



Yar. STELLiGERA Cornu ('72). 



Syn.: A.racemosav&r. spinosa Cornu ('72). 111.: Hine, '78, PI. VI, Figs. 1-14. 



A. colorata Viingsh. ('82). Pringsheim, '74, PI. XIX, Figs. 1-15 ; XXI, 1-3, 13 ; 



and XXII, 1-3. 

 Pringsheim, '82, PI. XIV, Figs. 13, 15-31. 

 Pringsheim, '83b, PI. VII, Figs. 10-20. 

 PI. XIX, Figs. 96-98. 



Oogonial walls more or less abundantly producing short, rounded outgrowths, 

 more deeply colored when old. Oospores very rarely exceeding five in an oogonium. 

 Otherwise as in the type. 



Massachusetts — Amherst and i!^orthampton : !N"ew Jersey — Glassboro', Keller : 

 New York — Ithaca, Hine: Louisiana — Bayou Tortue, Langlois. Europe. 



This form seems much more abundant with us than the type. It was first 

 recorded as American by Hine ('78) ; for although it was not definitely identified by 

 him, his figures are unmistakable. I have observed it in cultures from three different 

 sources in Amherst and its vicinity, including a swamp pool, a fish hatchery, and a 

 river ; also from a cedar swamp in New Jersey and from a Louisiana bayou. 

 Though the degree of development of the spines may vary considerably in different 

 specimens from the same culture, I have never seen a wholly smooth oogonium in a 

 culture of the spiny form, or a spiny one among those of the typical form. And it 

 is this fact which has seemed to indicate the propriety of characterizing the spiny 

 form as a distinct variety. The two spiny varieties named by Cornu ('72) are appar- 

 ently based on specimens with the spines respectively more and less developed ; and, 

 in the absence of evidence to the contrary, must be regarded as representing extremes 



