ALOJE OF WEST IRELAND. 105 



Class CYAKOPIIYCEiE Or PHTCOCUROMACEiE. 



Subclass NosTOcni^EiE. 



Ord. "NoSTOCACEiE. 



1. Nostoc sphjericum, Vauch. {Rabh. Fl. Europ. Alg. ii 

 p. 1G7.) 



Diam. thai]. 2*5-7 mm. ; diam. cell, veget. 4-4*5 /x; diam 



heterocyst. 6-7*5 //. 

 II. Tore Mt. 



1. Cylindrospermum macrospermum, Kuetz. {Rabh. I. c. 

 p. 186.) 



II. Muckross. 



tf 1. A^AEiEXA (SpILEROZYGa) ORTIIOGONA, nov. sp. (PI. XVIII. 



fig. 8.) 



A. trichomatibus subrectis, dispersis, dissepimentis constrictis, 

 pallide serugineis, articulis subquadratis : heterocystidibus glo- 

 bosis; sporis geminis vol singulis, magnis subrectangularibus 

 diametro 3-4plo longioribus, membrauis hypopachydermaticis. 



Diam. cellularum veget 5 /i ; 



„ heterocystidum 6-7*5 ki ; 



crassit. sporarum adultarum 10-12 /z; 



long. „ „ 30-38 p. 



II. In peaty pools north of Cromagloun. 



The vegetative cells generally appear distinct from each other, 

 being apparently connected by the mucilage; the decidedly 

 truncate spores, which are fully twice the diameter of the vegeta- 

 tive cells, are characteristic. 



2. A. Hassallii, Wittr. [Sphaerozyga Hassallii, Rabh. I. c. 

 p. 195.] 



Long. cell, veget. 7*5-10/1* crass, cell, veget. 5*5-7 /i ; long, 

 spor. adult. 17*5-22*5 ii ; crass, spor. adult. 7-8 ii. 

 I. Near Westport. 



Ord. Kivllariace.e. 



I. Calothrix Dillwyni, Cooke. {Brit. Frcshw. Alg. p. 276, 

 tab. 113. fig. 2.) 



II. Cloonee Lough. 



