SPECIES OF ALG^. 



mm. Oospore sub-globose, barely filling the oogon 



by 46-56>' 



nn. Diameter of oospore 37-45/^ by 40-50/^ 

 nn. " " " 5i-54>« by 73-85/* 



nn. Diameter of oospore 42-6oyU by 42-60/* . 

 00. Diameter of oogonia 40-45/i by 8o-ioo/* 

 00. " " " 63-75/* by 105-120/* 



00. " " " 70-85/t by 130-160/* 



00. " " '' 90-100/* by 130-150 



//. Diameter of veg. cells less than i6/< (gf). 

 pp, " " " " i6/i or more (rr). 



qq. Diameter of oogonia 17-18/* by 20/* 

 qq. " " " 24-28/* by 28-35/* 



qq. " " " 33-35M by 33-43M 



^^. " " " 24-25/* by 26-28/* 



rr. Diameter of oogonia 36-40/t by 44-45/* 

 rr. " " " 61-75/t by 68-80/* . 



ss. Diameter of veg. cells less than 25/* (/■/). 

 i.r. " " " " 25 /* or more [uu). 



tt. Diameter of oospore 35-36/* by 45-48/* 

 tt. " " " 15-16/* by 17-19/* 



uu. Diameter of oospore 54-65/* by 75-103/* 

 «a. " " " 45-50/* by 68-72/* 



41 



ia, diameter 42-50/* 



carbonicum, 90 



. capilliforme, 88 



pachyandrum, 89 



cardiacum, 90 



Boscii, 91 



Landsboroughi, 9 1 



I'ivulare, 92 



z^ar. major, 92 



delicatiilum, 93 



moniliforme, 93 



Londiense, 94 



hexagonum, 94 



. fonticola, 93 



princeps, 93 



pyriforme, 95 



longatum, 95 



gigateum, 94 



grande, 95 



II. BULBOCH^TE. 



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

 made in connection with CEdogoniutn 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." 



