THREE NEW VARIETIES OF HYPNUM FLUITANS 275 



are purple, and equally broad at either end ; those of plicata and 

 declinata are much shorter, but similar. Babington did not, I think, 

 believe in hybrids at the time I described pedicellata. I first named 

 it hybrida, but he persuaded me to alter the name." 



Cijstopteris fnujilis Beruh. var. dentata Hooker. HI. Dwarfie 

 Hamars, Hoy. 



Eqnisetiim palustra L. var. midiini Newm. 111. Orgill, Hoy. 



Isoetes echiuospom Dur. 108. Loch Modsarie. 



Cham fmiiilis Desv. 111. Peat-bog west of Stromness ; ap- 

 proachmg var. harbata.~C. aspera Willd. 111. Mill-pond between 

 Stromness and Sandwick.— Subspecies desmacantha H. & J. Groves. 

 Loch Stenness and Loch Harray ; a very dwarf form of it.— 

 C. baltlca Bruzel. 111.^:= South side of Loch Stenness; a very 

 interesting and unexpected discovery, the only previous British 

 localities being in the extreme south (Dorset and West Cornwall). 

 The identification is due to Mr. Crawford, who collected it there in 



August; it was confirmed by Messrs. Groves in both cases. 



C. vulgaris L. 111. Ditch near the Dwarfie Stone, Hoy. — Var. 

 lumjibracteata. Near Stromness. 



Nitella opaca Agardh. 108. Exceedingly variable both in size 

 and habit in Loch Deerie, near Tongue, where I quite thought that 

 I had found three dift'erent species ; all were, however, referred to 

 opaca by Messrs. Groves, who remark that they represent a verv 

 interesting series of forms. 109. Ditch near the Wick River. 111. 

 Near Stromness, Mainland ; pool between Orgill and Rackwick, Hoy. 



THREE NEW VARIETIES OF HYPNUM FLUITANS L. 



By H. N. Dixon, M.A., F.L.S. 



It requires some courage to propose a new variety of this species, 

 already so prolific in varieties and subvarieties (forty-nine forms' 

 find names in Sanio's scheme, Bot. Centralblatt, 1888) ; perhaps 

 indeed it demands some apology. A large number of our British 

 forms have passed through Mons. Renauld's hands since the 

 publication of his Monograph of the Harpidioid Hypna in Husnot's 

 Muscoloijia Gallica ; nearly all of these have been assigned more or 

 less readily to one or other of the varieties described in that 

 system ; but two forms which I recently sent to him difter from 

 any of these varieties in a marked degree, sufiiciently so in 

 M. Renauld's opinion to demand their separation as varietal 

 forms. He has kindly suggested that I should associate my 

 name with his in publishing these, and the following dia<^noses 

 are mainly drawn up from the notes and drawings with winch he 

 has furnished me. 



H. FLUITANS L. (amphibium) var. Robertsi^ Ren. & Dixon, 

 var. nov. Floating; variegated with yellow, golden broivn, and pur- 

 plish red, glossy; stems elongate, almost simple, with a few short, 



x 2 



