HOW TO KNOW THE FRESH-WATER ALGAE 



102a Cells spherical or oval, in 2's and 4's. separated from one an- 

 other by semi-opaque masses of dark mucilage which iorm 

 X-shaped bands. Fig. 83 GLOEOTAENIUM 



Fig. 83. Gloeotaenium Loitelsberqerianum 

 Hansg. 



This unique plant is rare but widely dis- 

 tributed. When it occurs at all it is rela- 

 tively abundant. Collections from the mix- 

 ture of algae in shallow water ponds and 

 bogs often yield this species. 



Figure 83 



102b Cells not separated from one another by masses of dark 

 mucilage 103 



103a Cells bearing long, needle-like spines (colonial only because of 

 entangled spines). Fig. 84 GOLENKINIA 



Fig. 84. Golenkinio radiata (Chodat) Wille. 



There are but 2 species of this genus re- 

 ported, both of them common in two sam- 

 ples from the open water of lakes. G. 

 radiata Chod. has spines 2 to 3 times the 

 diameter of the cell in length, whereas G. 

 paucispina West & West has more numer- 

 ous spines that are about equal to the cell 

 diameter in length. 



Figure 84 



103b Cells without spines 104 



104a Cells inclosed by old mother-cell wall 



105 



104b Cells not inclosed by old mother-cell wall 



106 



105a Cells somewhat bean-shaped or kidney-shaped, or broadly ellip- 

 tic (old mother-cell wall often appearing as a mucilaginous sheath). 

 See Fig. 59 NEPHROCYTIUM 



61 



