218 BRITISH 



as T. penioides, \)ni allowi'iiir suHiricnt latitude I'm- 

 Ik'iiiK-Lt's inaccurate drawings and observations, we have hille 

 hesitation in placing it under T. Brebissonii. 



Var. turgidus Rail's. (PI. XXXII, fig. 3.) 



s Brebissonii var. fiicc/i'i/ns Kalfs, Brit. Desm. 1848, p. 1-K>, t.-M, 

 f. 1 </, C; Cooke, Brit. Desm. 1880, p. i'J ; West, Alg. N. Wales, IS'.MI, 

 p. 280 ; lloy & Biss. Scott. Dcsiu. 1<S'J !, p. 2 12. 



Cells more deeply constricted; seraicells inflated. 



Length 155 /x; breadth (maximum) 43 44 /A; breadth 

 of isthmus !2(j ju. 



ENGLAND. Ashdown Forest, Sussex (Ealfs). 



\V.\LES. Snowdon, Carnarvonshire ! 



SCOTLAND. Not uncommon (L'n $ Itiwtt). Pertli ! 



(ti'uyr. Distribution. Poland. Australia. United 

 States. 



Var. attenuatus Xordst. 



Tctnionofiis Brebissonii var. attenuatus Nordst. in Botan. Notis. 11SS7, 

 p. 103 ; Freshw. Alg. N. Zeal. 1888, p. GO, t. 3, f. 18. 



Semicells more or less sensibly attenuated towards 

 the apices. 



Length 134-1D2 //, ; breadth 27-30 ^ ; breadtli of 

 isthmus 24 /x. 



SCOTLAND. Ben Laoigh, Perth ! 



< icoir. Distribution. New .Zealand. 



Var. minor De Bary. (PI. XXXII, figs. 4, 5.) 



Jln'bissonii var. mi/tor De Bary, Coiij. 18oS, ]>. 7u, t. ">, t. !> 

 i 1,'alis, 1. c. f. If); Kabeiih. Flor. Ettrop. Algar. Ill, 1808, p. 1U> : 

 >V Biss. Scott. Desm. 181)1, p. I'll'. 



Cells not more than half the size of the type ; semi- 

 cells broadest towards the apices, lateral margins 

 towards the base gently hollowed. 



Length (34-82 /A ; breadth (maximum) 17'5-20/u; 

 breadtli of isthmus 14' 5-1 5 /x. 



ENGLAND. Brandreth, Cumberland ! Hawkshead, 

 Lancashire ! 



