HYBRIDS AMONG BRITISH PHANEROGAMS 299 



0. metadata x Habenaria conopsea was observed near Sevenoaks 

 by Mr. Henry Peirson in 1898, and described in an interesting 

 note in this Journal (1898, 360). — 0. ericetorum x H. conopsea has 

 been gathered by Mr. Marshall in W. Sutherland, 1900, and at 

 Olova, Forfar, 1904 ; also in Berwickshire by Mr. G. C. Druce 



(Ann. Scott. Nat. Hist. 1907, 100). Another Habenaria hybrid is 

 H. albida x conopsea, first published for Britain in this Journal 

 (1898, 352), and previously recorded from the Austrian Alps. 

 Specimens from Arisaig, W. Inverness, were submitted to Mr. Rolfe 

 and myself by Major A. H. Wolley-Dod, and we both arrived at 

 the same conclusion independently. I grew my root and flowered 

 it for three years, and noted that it matured no capsule ; from 

 which sterility might be inferred, or the absence of the right moth. 

 Since that date this hybrid has been gathered by Mr. Marshall at 

 Tongue, and at Scullomie, W. Inverness. — Ophrgs apifera X Arach- 

 nites, O. apifera X aranifera, and 0. Arachnites X aranifera are 



recorded in the Flora of Kent (1899), with full particulars and 

 comments. In 1905 a presumed natural hybrid between O 

 aranifera and 0. muscifera was found on Wye Downs, Kent, and 

 described and figured in the Orchid Hevieiv (1905, 233) and in this 

 Journal (1906, 347). Found long ago in Germany, and figured 

 by Reichenbach, 



Juncace^e. — Juncus effusas x glancns (J. diffusus Hoppe) has 

 long been known, and is recorded from thirty-six vice-counties. I 

 have always found it sterile. — J. conglomerates x glaucus was 

 found by Rev. W. R. Linton and myself twenty years ago in 

 two parishes in E. Norfolk ; this, too, was sterile. The Rev. 

 E. S. Marshall once gathered in Kent what he believed to be this 

 hybrid, as both supposed parents were present, and J. effusus was 

 absent. The inflorescence in the Norfolk specimens was almost as 

 much condensed as in J. conglomerates. — J. acutiflonts x iampro- 

 carpus is on record, by Mr. \V. H. Beeby ; my Norfolk specimens 

 seemed quite sterile. — Luzula Forsteri x vernalis (L. Borreri 

 Bromf.), which forms large tufts at Symond's Yat, and is more 

 conspicuous than either parent there, and has a fairly wide distri- 

 bution, is completely sterile. 



Typha latifolia L. var. media Syme may be a hybrid between 

 our two species. At any rate, I have long believed specimens I 

 gathered in the railway pool near Bletchley Station and called 



media to be the hybrid. 



NaiadacejE. — Potamogeton. In this puzzling genus hybridity is 

 believed by our best judges to have played an important part in 

 producing what are now well-established forms or "species." The 

 hybrids are usually sterile, setting it may be an occasional fruit (I 

 found only two in a large number of specimens of P. salicifoiius the 

 Rev. A. Ley and I gathered in the Wye) ; and Mr. A. Bennett tells 

 me of a fruiting P. decipiens Nolte from near Burwell, Cambs, as a 

 very exceptional case. The following notes on this genus are from 

 what Mr. Bennett has furnished me with, unless Mr. A. Fryer, who 

 has also contributed several valuable notes, is quoted by name. 

 P.natans x litcens (P. jiuitam Roth). — P. natam X Zizii [P.crassi 



