10-i TRANSACTIONS OF THE [Sess. lxxx 



Under leaf indumentum bistrate. Surface pitted not 

 smooth hazel brown of long-stalked cup scales with 

 fringing long hairs often deciduous and uncovering a 

 lower series of colourless scales. Flowers white blotched 

 crimson. 



Since my note appeared in the Gardeners' Chronicle, 

 March 25, 1916, I have been asked the question by Sir 

 Edmund Loder, Bart. — What is Rh. ladeum, Franch. men- 

 tioned b}^ Rehder and Wilson ? ^ and he has kindly sent me 

 a leaf of this plant grown at Leonardslee under Wilson's 

 number 4254. I have also received a leaf of the same 

 plant from Lieut. Commander Millais who is engaged in 

 preparing a monograph of the genus Rhododendron. A 

 glance at the indumentum of the leaf suffices to tell that 

 Wilson's Xo. 4254 is not Rh. lacteum, Franch. A more 

 careful analysis tells that it is not Rh. fictolacteum, Balf. 

 fil. I must point out however that Rehder and Wilson say 

 of their " specimens which are in ripe fruit onl}^ " that they 

 " appear to be identical with Franchet's plant." What the 

 plant is may be determined when it flowers. I expect it 

 will prove to be a new species. I have seen no specimens 

 of Wilson's 8431. 



A Hybrid Potamogeton new to the British Isles. 

 By Arthur Bennett, A.L.S. 



(Read 13lli April 191G.) 



In August 1915 Messrs. Barclay and Matthews sent me 

 some gatherings of Potamogeton from the river Earn, near 

 Dunning, in mid. Perth, V.C. 88. They included P. decijnens, 

 Xolte, P. criapus, Linn., and many specimens of x P. ven- 

 ustus, Baagve = P. crispus x alpinus, Balb. This rare 

 hybrid has only been recorded from Denmark, and was 

 found there by Herr Baagve in the river Gudenda, in 

 Jyllandia, and the river Vigersdala, in Saellandia, in 1879. 



The Scottish specimens are of the two nearer crispus, 



while the Danish ones are about half-way between the two 



species. At this date no alpinus was gathered, but alpinus 



is on record for the Earn from near Dupplin and Forteviot, 



' Reliderand Wilson, Plantae Wilsonianae, i (1913), 545. 



