346 THE BOTANICAL EXCHANGE CLUB OF THE BRITISH ISLES. 



Britain, which is probably the case, and also the hybrid referred to by 

 Dr Woynar. Tn Cumberland I gathered germanicum 1 where it was 

 growing with both septentrionale and the Wall-rue, but I only saw 

 about three tufts, although there were over thirty of septentrionale. 

 Neither am I aware if germanicum has been ever found in Britain in 

 the absence of the Forked Spleenwort. G. C. Druce. 



2896. Dryopteris Filix-mas Schott var. Twinstead, Essex N., 

 July 1913. A remarkable form which at first suggested a hybrid of 

 D. Filix-mas x D. aristata, as both species grew near, but Mr F. W. 

 Stansfield, in lit. states that " T think your fern is pure blood Filix- 

 mas of which it constitutes a very fine variety (a decompositum) not 

 many of which have been found. Sir (then Dr) W. H. Allchin found 

 one in Ireland about 1870, but I do not think it was as good as 

 yours." G. C. Druce. 



2907. Polypodium vulgare L., var. semilacerum, forma 

 falcatum O'Kelly. Bally Vaughan, Co. Clare, P. O'Kelly. Differs 

 from all the other semilacerum forms by the peculiar falcate curving of 

 the pinnae and the obtuseness of the sub-divisions. C. T. Druery in 

 The British Fern Gazette 108, (with figure) 1913. 



2923 (2). Azolla filiculoides Lam. This was noticed 

 in a ditch on Midsummer Common, Cambridge, in October 

 1913. It is not known how it came there. The only species 

 of Azolla previously grown in the Botanic Gardens at 

 Cambridge is A. caroliniana Willd. The plant was gathered 

 with both microsporangia and megasporangia in November, 

 and the glochidia were seen to be mostly non-septate, though 

 one or two had a single septum towards the apex. The vegetative 

 plant is more branched and much thicker than A. caroliniana, and not 

 appressed to the surface of the water. The species (A. filiculoides) is 

 indigenous only in South America. One of my students, Mr A. S. 

 Marsh, will shortly publish an account of the occurrence and natural- 

 isation of A. filiculoides and A. caroliniana in Europe. I may add 

 that so far the character of the hairs of the leaves does not seem to be 

 decisive. C. E. Moss, in lit. 



