1918-lO.J BOTANICAL SOCIETY OF EDINBURGH 381 



o'lossy and more pointed than those of T. \"it is-Idaea, and, 

 on the other liand, tougher and more deeph^ veined than 

 those of V. Myrtillus, from which plant the hybrid can be 

 distinguished by its subterete stem and less upright habit. 



The h3^brid flower is roughly intermediate in shape and 

 colour between those of V. Myrtillus and 1'^. Yitis-Idaea, 

 but the anthers are provided with conspicuous dorsal awns, 

 thus favouring V. Myrtillus. (The anthers of V. Vitis- 

 Idaea are described in most of the text-books as " awn- 

 less." In most of the specimens that I examined in Staf- 

 fordshire, small and inconspicuous dorsal awns were present. 

 Some, however, appeared to be awnless.) 



The hybrid fruit is a little smaller than that of 

 V. Myrtillus or T. Yitis-Idaea. It is plum- violet in colour, 

 and slightly longer than broad, but more regular in outline 

 than that of T^ j\[>/rtillus. The latter often appears as 

 if truncated about the calj'x scar. 



The hybrid produces little fruit, and the berries contain 

 only a small proportion of well-developed seeds, though in 

 this respect different patches show great variation. I have 

 found large patches without sign of flower or fruit : and 

 from a comparatively small patch (measuring 3 bj' 7 

 yards) I have picked over 200 ripe berries without ex- 

 hausting the supply. One hundred of these berries, how- 

 ever, only jnelded 209 apparently well-developed seeds, 

 against more than 300 seeds for 100 berries collected from 

 a variety of patches. 



Professor Bonney found Vacciniwni intermediuni in full 

 flower on Cannock Chase on August 29, 1886, but found 

 only two ripe berries. I found the plant in full flower at 

 the end of ]\Iay 1919, and in full fruit in the middle of 

 August. However, in the latter half of the month manj- 

 of the patches were again in flower or in bud, including 

 the one found flowering in May. Thus the hybrid, like 

 V. Myrtillus, is wont to produce two crops (of flowers at 

 any rate) during the season. 



On August 23, 1919, I spent the greater part of the day 

 in the Whitmore district of N.W. Staflbrdshire. Maer 

 Heath and Whitmore Common are separated by a valley 

 through which runs the main line of the L. & N.W. Railway. 

 With the same Bunter grouping of pebble beds and sand- 



