FRESH-WATER DIATOMS FROM ICELAND 33 



♦Pinnularia Legumen Ehr. Cl. Syn. II, 78. V. H.Trt., Tab. II, fig. 98 



(Nav. Leg.). 



Reykjanes (N.) Thor., in a hot spring, Ulfshær (X.) B. P. 

 Area : Ubiquist, Grl. 



Var. longa A. Cl. f. interrupta A. Cl. Fini., 28, Tab. 1, fig. 26. 

 TorfastaiMr (S.) A. F., in a hot spring. 

 Area: Eur. 



Pinnularia parallela Brun var. crassa Øst. Øst. D. D., 99, Tab. Ill, 

 fig. 64. 



Staöastaöur (S.W.) H. Js. 

 Area: Eur. 



Pinnularia platycephala Ehr. Cl. Syn. II, 79. Cl. Fini., Tab. II, fig. 1. 

 A. S. All., Tab. CCCX, figs. 6— 8. 

 Froöarheiöi (S.W.) H. Js. 

 Area: Eur., Grl.,' J. M. 



Distantes Cl. 1895. Cl. Syn. II, 80. 



Pinnularia alpina W. Sm. Cl. Syn. II, 81. V. H. Trt., Tab. XXV, 

 fig. 705 (Nav. alp.). 



Sandbrekka (E.) H. Js., Seyöisfjord (E.) B. P. 

 Area: Eur. 



Var. linearis var. nov., Tab. nost. III, fig. 49. 



Long: 64 //, lat: 14,4 ii, str. 5 in 10 /<. 



Valva lineari, apicibus rotundatis. Raphe area hyalina, media 

 in parte valvæ in aream rotundatam dilatata, cincta. Fissuris ter- 

 minalibus semicircularibus. Slriis radiantibus, apices versus con- 

 vergentibus. 



Sævarendi (E.) B. P. 



Owing to the radiate-convergent striæ, I consider this form should 

 rather be classed with Pinnularia alpina than with Pinn. lata. It has 

 hardly anything to do with Pinn. borealis. 



♦Pinnularia Balfouriana (min. Cl. Syn. II, 80, Tab. I, fig. 18. A. S. 

 All., Tab. CCCXIII, figs. 29— 31. 



(i samples (S. 2, S.W.I, N. 2, E. 1). Hot springs; 2. 

 Area : Eur., Fz. J. 



♦Pinnularia borealis Ehr. Cl. Syn. II, 80. V. H. Tit., Tab. II, fig. 77. 

 195 samples (S. 32, S.W. 49,' N.W. 9, N. 39, E. 64, s. I. 2). Hot springs: 17. 

 Never in great numbers in the samples. 



Area: Ubiquist, Grl., J. M.. B. E., Sp . Fz. J. 



Var. brevicostata Hush Must. Sud., 82, Tab. nost. Ill, fig. 50. 

 Long: 25 //, lat: 7 ft, str. 5 in 10 //. 



The Botany of Iceland. Vol. II. 3 



