ME. A. G. MOBE ON EESTUCA AMBIGUA. 189 



individual beautifully figured in the botanical part of the ' Expe- 

 dition scientifique de l'Algerie,' plate 36. The description of the 

 plant is not published as yet in that work, but an extract from 

 the manuscript will be found in Cosson's ' Notes sur quelques 

 Plantes nouvelles, ou Critiques,' pp. 70-72, also in the ' Compt. 

 Eend. Acad. Sc' vol. xviii. p. 1167. 



Lloyd has well described it under the name of I. Delalandei, 

 in his ' Flore de l'Ouest de la France,' p. 549. 



The plant was first taken for I. Duricei, Bory ; but that species 

 has very different larger spores, and apparently also different 

 small ones. 



CUAELES C. BaBINGTON. 



On the Occurrence of Festuca ambigua, Le Gall, in the Isle of 



Wight. By Alexandee Gr. Moee, Esq., F.L.S. 



[Bead Feb. 7th, 1861.] 



It is now several years since my attention was drawn to a re- 

 markable grass which grows abundantly on the sea-side sandhills, 

 or " dunes," at St. Helen's, in this island. 



I have no doubt that it is the plant mentioned by Dr. Bromfield 

 in his ' Flora Vectensis,' p. 606, as a variety of Festuca uniglumis, 

 (Sol), characterized as having 3-flowered spikelets and monandrous 

 florets ; for, when I submitted some specimens from St. Helen's to 

 Mr. Borrer, he informed me that he had himself gathered the 

 same grass on " Eyde Dover," that being the very station given 

 by Bromfield for his variety j3. That Dr. Bromfield subsequently 

 felt some doubt as to this "variety" may be inferred from his 

 having omitted all mention of it in his " Catalogue of Hampshire 

 Plants " published in the ' Phytologist.' 



Our plant is, in aspect, somewhat intermediate between Vulpia 

 (Festuca) uniglumis and V. pseudo-myurus, growing intermixed 

 with the former, and resembling it a little in its compact and 

 upright panicle (though the panicle of Vulpia amligua is not 

 nearly so stout as that of V. uniglumis). This resemblance, how- 

 ever, is only superficial, -and a closer examination shows the true 

 affinity of our grass to V. pseudo-myurus, with which the St. Helen's 

 Vulpia agrees in the important characters afforded by the single 

 stamen and by the constant presence of both glumes ; besides that 

 the larger glume of Vulpia ambigua is destitute of the awn found 

 in V. uniglumis. It was in accordance with this view that I, last 



LINN. PEOC. BOTANY, VOL. V. P 



