SPECIES OF ALGJE. 4! 



;;/;;/. Oospore sub-globose, barely filling the oogonia, diameter 42-50^ 



by 46-56/1 carbonicum, 90 



nn. Diameter of oospore 37-45^ by 40-50^ . . . capilliforme, 88 

 nn. " " " 5i~54/* by 73-85 // . . pachyandrum, 89 



nn. Diameter of oospore 42-60/1 by 42-60/1 .... cardiacum, 90 

 oo. Diameter of oogonia 40-45^ by 8o-ioo/f .... Boscii, 91 

 oo. " " " 63-75 fJL by I05-I20/* . . Landsboroughi, 91 



oo. " " " 7 0-85 /i by 130-160/1 . . . rtvulare, 92 



oo. " " " 9o-ioo/e by 130-150 . . . var. major, 92 



pp. Diameter of veg. cells less than i6/t (qq). 

 pp. " " " " i6yu or more (rr). 



qq. Diameter of oogonia i7-i8/f by 2o/< .... delicatulum, 93 

 ^. " 24 2 8// by 2 8-35 /^ .... moniliforme, 93 



^. " 33-35/^ y 33-43/^ .... Londiense, 94 



^. " " " 2 4-2 5 /f by 26-28^ .... hexagonum, 94 



rr. Diameter of oogonia 36-40^ by 44-45^ fonticola, 93 



rr. " " " 61-75/4 by 68-8oyw princeps, 93 



jj. Diameter of veg. cells less than 25/< (//). 



ss. u " " " 25/f or more (). 



//. Diameter of oospore 35-36^ by 45-48^ .... pyriforme, 95 



tt. " " " i5-i6ywby 17-19^ .... longatum, 95 



^. Diameter of oospore 54-65^ by 75-103/1 . . . gigattum, 94 



uu. " " " 45-50^ by 68-72^ .... grande, 95 



II. BULBOCHvETE. 



In reference to the sixteen species forming this genus, the remarks 

 made in connection with CEdogonium might be repeated. The spe- 

 cies can be identified only when in fruit; to make an artificial key is 

 therefore almost an impossibility. 



Replying to a personal inquiry in regard to the division of the 

 species into monoecious and dioecious groups, with the presence of 

 dwarf males on or near the oogonia of all the so-called dioecious 

 forms, Mr. Wolle writes: "These male forms are not developed 

 when they appear; they are supposed to have been formed in dis- 

 tinct cells known as androsporangia, and when they have developed 

 and escaped, they float about and then attach themselves on, at or 

 near the oogonium, but they are not necessarily a part of the plant 

 on which they may be seated." 



