HYBRIDS AMONG BRITISH PHANEROGAMS 303 



C. jndla Good., but so near one parent or the other that I have not 

 been fully satisfied. 



Graminace;e. — Alopecunts geniculatus X pratensis (A. hybridus 



Wim mer) from near Keniiworth, Warwickshire, named by Hackel, 

 to whom Mr. A. B. Jackson sent it, and from Armitage, Staffs. 

 (Joiirn. Bot. 1901, 284; B. E. C. Rpt. 1900, 650).— Poiypogon 

 littoralis Sm. is, I think, undoubtedly Agrostis palustris Huds. X 

 Polpogon monspeliensis Desf. I have seen it with these supposed 

 parents at Porchester, S. Hants, and also at Littlesea, Dorset. 

 From the latter locality I grew a root for three years in the garden, 

 and as no seedling occurred, I assume it is sterile. — Ammophila 

 baltica R. & S., Norfolk and Northumberland, has long been 

 regarded by German botanists as Ammophila arundinacea Host x 

 Calamagrostis epigeios Roth. Focke {I. c. pp. 408-9) writes : u Calama- 

 grostis armaria Roth x epigeios Roth occurs sporadically on the 

 coasts of the North Sea and the Baltic, everywhere sparingly. 

 Habit of C. arenaria, but recalling strong epigeios by the loose, 

 brownish inflorescence. Occurs by the North Sea on islands from 

 which C. epigeios is now absent, but probably grew formerly. Is 

 totally sterile* C. arenaria = Psamma arenaria R. et Sch., Ammo- 

 phila arenaria Link, &c. M The seeds of seaside grasses can be carried 

 about in so many ways, by gales, tides, and wading birds' muddy 

 feet, that the hybrid's occurrence, where one of the parents is 

 absent, is easily accounted for. — Poa. Mr. Marshall writes to me 

 that Mr. H. Fisher determined some years ago two grasses which 

 he collected in Corrie Ardran, Mid-Perth, as P. annua x pratensis, 

 n. hybr. and P. annua x glauca, n. hybr. ; and a third, from Ben 

 Creachan, Argyle, as probably P. nemoralis x pratensis. He be- 

 lieves that these solutions, or, at any rate, the first two, are correct, 

 Glyceria fluitans X plicata (G. pedicellata Townsend) is perfectly 

 sterile, fide Rev. W. R. Linton. Mr. Marshall tells me that Mr. 

 Townsend from the first suspected hybridity, and latterly was con- 

 vinced of it. — Festuca loliacea Huds. stands in the London Catalogue 

 as F. elatior X Lolium perenne. I think the hybrid, as I have found 

 it, has usually been F. pratensis x L. perenne. — Triticam acutum 



DC. (Agropyron acutum R. & S.) is given by Messrs* Groves in 

 Bab. Man. without note of hybridity, but we have for some years 

 been tending to the view that most of our plant, so-called, is T. 

 junceum x repens. " It has received many names by botanical 

 writers, and is the T. acutum for the greater part of our British 

 lists,' ' writes Mr. Druce, who, however, thinks it needs one more, 

 and denominates it "A. Hackelii mihi, A. repens x junceum forma 

 cristata Hack, in Utt. n (B. E. C. Rpt. 1906, 252). 



To this paper on Hybrids among Phanerogams, I add such few 

 notes as have reached me on Hybrids among the Cryptogams at the 

 end of the London Catalogue. 



PoLYPODUCEiE. — Aspleniuni Trichomanes x Ruta-muraria (A. Cler- 

 mont a>, Syme). — A. germanicum Weiss has been thought to be A. 

 Ruta-muraria x septentrionale, a view held strongly by the Rev. R. P. 

 Murray. " A. Kerner has suggested that it may be a hybrid which 

 has become fixed u (Focke). — Lastrea remota Moore has been 



