130 BIOLOGY OF THE RICHMOKD RIVER, 



any valid reason for retaining the genus Li/ngbr/a. Cf. Gomont's 

 remarks, Monog. d. OscilL, ii., pp.92, 93. 



OSCILLATORIA SPLENDIDA Var. ATTENUATA W. & G. S. West. 



Fila diam 2J-3; cell, disjunctis, alt. 4-10 /x. 



Lismore {20b). Cum forma typica. 



Fila diam. 2^-3; cell, conjunctis, alt. 4; cell, apic, long. 8-20, 

 lat. 1-1 i/x. 



Lismore (12, 13, 20). 



0. splendida Grev., (0. leptotricha Kiitz., in Mobius, Austral. 

 Siissvv., p. 449, f.22; Bailey's Bot. Bull, vi.) is common in rivers 

 and creeks here, but the type-form, as in Gomont, I.e., T.7, f.7, 8, 

 is very rare. I have only once seen it. The colour of 0. 

 splendida in all its forms is a characteristic pale blue, hardly ever 

 greeny-blue, and the filaments very translucent except in var. 

 amylacea. The cells are occasionally disjoined, and the two 

 minute granules at each side of the septa, as figured by Gomont 

 and W. tfe G. S. West, are very rarely found here. (PI. vi., f.3). 



Var. LiMNETiCA (Lemm.) mihi. (PI. vi., f 4). 



Fila ut in forma typica vel in var. attenuata, dissepimentis 

 autem utrinque granulis magnis singulis ornatis. 



Diam. l|-2; cell. alt. 3-10, ssepe 8 /x; apicibus rotundatis vel 

 modice attenuatis. 



Lismore (13); with var. amylacea in Lynghya stratum (26). 



Diam. 1^-3; cell. alt. 6-10, ssepe 8 fx; apicibus attenuatis sub- 

 capitatis diam. \h jJ^. 



Coraki, river-brink, with var. amylacea in Spirulina stratum 



(■11). 



In this country, forms of 0. splendida, if granulate at all, 

 ahnost invariably have a large single granule at each side of the 

 dissepiments. I have only once seen it otherwise. That these 

 are forms of 0. splendida, is evident, as they often possess the 

 characteristic apex of var. attenuata. In sample No. 153, from 

 Canley Vale, near Sydney, a pure growth of this kind is pre- 

 served, filaments diam. 2 jx, cell. alt. 3-6 /x, sheath distinctly 

 observed, and many of the filaments are twisted exactly as in 

 Lynghya ])erelegans Lennn., Volz ges. siisswasseralg., T. xi., f.l4. 



