214 NATIVE BRITISH ORCHIDACE.E 



O. maculata was seen.^ In late May, 1950, 1 found it on heatWand covered with Ulex 

 Gain at Sus, Basses Pyrenees, France, where it was scarce, and so different in appearance 

 that at first I thought it was sometliing new. Formerly supposed to be a northern 

 plant, its occurrence so far south seems to show that the peaty or sandy soil of heaths 

 is the chief essential for its presence.* 



Fertilisation. I took a specimen of Bomhus terrestris L. cj on a Dutch specmien 

 of elodes in Mr St Quintin's greenhouse at Scampston Hall, Malton, Yorks., m 

 June, 1930, and saw it visited once by Bombus agrorum at Sus, and several times by 

 Eftipis tesselata $, ? (Diptera: Empidie), each fly with one or more pollinia on its 

 head in the New Forest, June 13th, 1931. 



ORCHIS MACULATA x sub-sp. ELODES 

 PI. G, fig. 5 (p. 191). xO. transiens Dr. 



Fig. 5 has flowers like a heavily marked 0. maculata with the long very slender spur 

 ot elodes. Side-sepals spreading; side-lobes of Hp broad, crenate, mid-lobe long, pro- 

 jecting. Aberystwyth, June, 1928 (T. Stephenson). A similar specimen from a neigh- 

 bouring locaUty had much fainter markings. 



Dr Druce saw many intermediates, some with leaves of 0. maculata, but flowers 

 of nearly t}T5ical elodes, growing together on Oxford Clay at Memiiarsh, Oxon. 



A plant found by me in Teesdale"^ July, 1930, had nearly white flowers with bright 

 violet loops and spots on the wedge-shaped Hp, with broad truncate side-lobes, and 

 shorter mid-lobe, narrow sepals and straight cyhndrical spur as in elodes, but not so 

 slender. The transverse oval leaf-spots were hke those of 0. maculata. 



ORCHIS MACULATA x PRiETERMISSA 

 PI. 49 A (p. 202); PL G, fig. 2 (p. 191). xO. MortoniiDr. 



(i) Stem 40 cm., hollow. Leaves narrower and more acute than in pmtermissa, 

 faintly spotted, the largest leaf 21 cm. x 2-5 cm., unspotted. Spike short, ovate, 

 comose. Flowers very Uttle larger than in maculata, pale mauve with bright red- 

 violet lines of dots and dashes on the hp. Lip shaped as in pmtermissa, whitish m 

 the centre, shallowly 5-lobed, mid-lobe triangular, side-lobes rounded, edges turned 

 up. Spur straight, nearly cylindrical, thicker than in maculata. Bracts very narrow, 

 twice as long as flowers, upper longer than buds. It has the fades of maculata, but 

 with larger flowers of the shape and colour oi pratermissa. 

 Foimd near Godakning, July ist, 191 8! 



I Bull. Soc.Bof.de France, p. ^"iA {'^9^^)- 1 ui .. 



= The occurrence of O. elodes Gr. on Umestone in the two locabties given is very remarkable, as 



it appears as a rule to shun calcareous ground. 



