Phytogeographical Excursion in the British Isles. 37 
2433. 7. subnodulosus Schrank was plentiful in the area of the 
Norfolk Broads and appears to prefer basic soils. 
2435. 7. articulatus L. var. nigritellus (D. Don) Southport 59. 
2437. 7. bulbosus L. var. Kochit (Schultz) Druce. Southport 59, 
Foulshaw 69, The Lizard 1, Roundstone, Galway. Usually this 
variety has six stamens but forms with four also occur; its upright 
habit distinguishes it from the type. The form fluitans also 
occurred in many of the Irish streams. 
2440. 7. Gerardi Lois. Common on the salt-marshes of the 
coast of Norfolk 28, Lancashire 59, Westmoreland 69, Dublin and 
Galway. 
2441. 7. tenuis Willd. This aggressive American species 
which is found yearly in new localities through Central Europe, 
was gathered on the road-side near Lawers 88. 
2442, bis. J. ranarius Perr. & Song. Nees in Linnea XX, 
243, 1847. (7. bufonius var. ranarius (Nees) ). In the damp 
hollows of the sand-dunes at {Southport 59. Professor Graebner 
says it is an analogous plant to 7. Gerardi and bears the 
same relation to bufonius as the latter does to compressus. It 
keeps its characters of the shorter and broader capsules and of the 
shorter perianth-segments, etc. in cultivation. I collected it at the 
North Bull, Co. Dublin 21. [Mr. Travis also sends it me from 
Ainsdale, Lancashire 59}. 
2452. Yuncoides pilosum Morong (Luzula pilosa). Ascending 
to over 2,200 feet on Ben Lawers, but with a different facies from 
the lowland plant. 
2462. Sparganium neglectum Beeby. Silverdale 69. 
2465. S. natans L. (S. affine Schnitz.) at the Trossachs 87, 
and with S. minimum Fries occurs in Loughs near Roundstone. 
2476. Alisma Plantago-aquatica L. var. latifolium Kunth. 
Near Woodbastwick +27. 
2477. Echinodorus Ranunculoides Engelm. Southport 59 
var. repens (Davies) Killarney. 
2479. Sagittaria sagittifolia L. with extremely narrow aerial 
leaves in the Broads, as at Barton, and Hoveton 27. 
2485. Potamogeton natans L. x P. polygonifolius (Pourr.— 
P. gessnacensis Fisch.—=P. polygonifolius f. linearis Syme). This 
plant grew in great abundance in the Swift Stream (Upper Range) 
between the Upper and Middle Lakes at Killarney, where it seems 
to be always sterile. The consensus of opinion expressed by those 
who saw it was that it was a sterile state of P. natans. 
2486. P. polygonifolius Pourr. This was seen as the heath 
state near Perranwell (where it simulated to some degree P. 
coloratus) Cornwall, at Dunkeld, and as a very narrow-leaved form 
at Craigga More, Galway. 
2489. P.alpinus Balb. Occurred in Loch na Chat, Lawers 
and also close to Lawers Pier, Mid-Perth. 
2493. P. gramineus L. (heterophyllus) Roundstone. 
2503. P.crispus L. var. serratus (Huds.). Butterston Loch 89. 
2508. P. pusillus L. Asa small form at Roundstone, 
2520. Zostera marina L. var. angustifolia Horn. Hayling 
Island with 2521 Z. nana Roth. 
2525. ~“Aponogeton distachyum Thunberg. An African species 
quite naturalised in a small Loch in the Dunkeld policies, E. Perth 
!89, where it was doubtless planted, 
