Vol. 2] Gardner. — Cytological Studies in Cyanophyceae. 239 



(a) SPECIES STUDIED. 



The writer has been very fortunate in being located where 

 such an abundance and variety of material may be found at_alL 

 seasons of the year, having collected and studied over a hundred 

 species in this vicinity. Many greenhouses, which are everywhere 

 fertile sources for a number of species, are accessible. Many 

 fresh-water springs and ponds, besides the salt marshes and the 

 Pacific Ocean, teem with members of this group. 



This abundance of living material at the writer's disposal all 

 the year round has enabled him to make a free selection of the 

 more typical members of each section of the group. 



The principal species here studied are the following : — 



Chroococcaceae. 

 Aphanothece sp. 



Synechocystis aquatilis Sauvageau. 

 Synechococcus curtus Setchell MS. 

 Merismopedia Gardneri (Collins) Setchell. 

 Merismopedia glauea (Ehrenberg) Nageli. 



Chamaesiphonaceae. 



Dermocarpa fucicola Saunders. 

 Dermocarpa prasina (Keinsch) Bornet. 



Heterocysteae. 



Andbaena circinalis Kabenh. 

 Anabaena Flos-aquae Brebisson. 

 Anabaena Azollae Strasburger. 

 Anabaena variabilis Kiitzing. 

 Aphanizomenon Flos-aquae Ealfs. 

 Cylindrospermum lichenif orme Kiitzing. 

 Cylindrospermum majus Kiitzing. 

 Calothrix Braunii B. & F. 

 Calothrix parietina (Nageli) Thuret. 

 Calothrix Crustacea Thuret. 

 Eassallia byssoidea Hassall. 

 Nodularia armorica Thuret. 

 Nodularia sphaerocarpa B. & F. 

 Nostoc microscopicum Carmichael. 

 Nostoc ellipsosporum Eabenhorst. 

 Nostoc pruniforme Agardh. 

 Scytonema Javanicum Bornet. 



liomocysteae. 



Lyngbya Lagerlieimii Gomont. 

 Lyngbya aestuarii Liebman. 

 Microcoleus chthonoplastes Thuret. 

 Oscillatoria margaritifera Kiitzing. 



