446 CUPULIFEKAE 



5. Lioddon. Bui marsh, very fine specimens, ri//nai7. Finchampstead. 

 Windsor Park. Bracknell. Bagshot. Sandhurst. Bisham 

 Wood. Frequent in the south-west. 

 The aggregate species constituting B. alba, Linn., is locally common 

 in the county. 



The foregoing records are for the restricted species, which is recorded 

 for all the bordering counties except E. Gloucestershire. 



Loudon says the Birch is supposed to have been once so plentiful in 

 Berkshire as to have given the name to that county, Arboretum, iii. 1695. 



B. pubescens, Ehrh. Beitr. iv. 160. (1789). Birclt. 



B. glutinosa, Wallr. Sched. Crit. 497 (1822). 

 Top. Bot. 372. Syme, E. B. viii. 186, t. 1296. Nyman, 672. Fl. Oxf. 276. 

 Native. Sylvestral. Heathy woods, on light soil. Local. Tree. 

 April-May. 



First found by the author in 1880 ; recorded by the Rev. W. M. Rogers 

 in Journ. Bot. 343, 1887. 



2. Ock. Cothill. 



3. Pang. Fence Wood, W. M. Rogers. Tidmarsh, Tufnail. Tilehurst. 



Bucklebuvy. 



4. Kennet. Aldermaston. Hampstead Marshall. Mortimer. Green- 



ham. 



5. Loddon. Bulmarsh, Tufnail Early. Bearwood. Bracknell. 



Ascot. Sunninghill. Finchampstead. 



Two forms of this Birch are described, one with the fruiting and 

 sterile branches glabrous = B. ca'rpatica, Waldst. et Kit. in Willd. 

 Sp. PI. iv. 464 ; the other has the barren, and sometimes the fruiting 

 branches pubescent ; it is the var. vestifa, Gren. et Godr. Fl. Fr. 

 iii. 148. 



B. pubescens is recorded for all the bordering counties except 



E. Gloucestershire and Bucks. 



I am afraid I liave neglected to observe in a thorough manner the distri- 

 bution of the segregate species B. alba and B. pubescens ; oftentimes, in 

 thickets, &c., the trees do not produce catkins, and the period when the 

 catkins are in proper condition for exact examination is rather hmited. 



AliNITS, Gaertn. Fruct. ii. 54, t. 90 (1791)- 

 A. g-liitinosa, Gaertn. 1. c. (1791), and Medic. Pfl. Anal. 393. Alder. 

 Betula Alnus, var. a. glutinosa, Linn. Sp. PI. 983 (1753)- Alnus, 

 Gerard, 1294. 

 Top. Bot. 372. Syme, E. B. viii. 178, t. 1294. Nyman, 671. Fl. Oxf. 276. 

 Native. Paludal. River-sides, damp woods. Not common in the 

 north of the county, and scarce or absent from the central 

 plateau, but frequent in the south, especially by the banks of the 

 Loddon and Blackwater. Tree. January 28-April. 



