FLORA OF OXFORDSHIRE. 415 
rib on the capsule instead of eight, and is found only on igneous rocks in 
the north. 
O. cupulatum, Hoffm. 
Limestone rocks, walls, roofs, and bridges. April. Ascott-under- 
Wychwood, fine; Witney; Forest Hill; Littlemore; Cowley ; Hincksey. 
Var. nudum near Sparsey Bridge. Less frequent than the last, liking a 
greater amount of shade and moisture. 
O. obtusifolinm, Schrad. 
Tree-trunks, rare. No fruit in Britain. On ash trees near Godstow, 
scarce; mixed with 0. tenellum and diaphanum: 1878. 
O. tenellum, Bruch. 
On trees, rare." May, June. Willows by the Cherwell in several places, 
but scarce ; by the Thames near Godstow and Botley; ash trees Rousham 
and near Wytham and Godstow. 
O. affine, Schrad. 
On trees, especially in woods and by streams, rather frequent and some- 
times plentiful. June, July. Windrush Valley; Cherwell Valley; 
Nuneham ; Stokenchurch and Henley; Bagley Wood, Pusey, Buckland, 
etc. 
O. diaphanum, Schrad. 
On trees; willows by streams, hedge-row elms, ete., frequent; also 
occasionally on stone walls. March, April. 
0. Lyellii, H. & T. 
Trunks of trees, chiefly oaks in large shady woods ; rare in fruit. June, 
July. Wychwood Forest; Singe Wood; Coggs; Bladon; Hell Copse, 
Stanton St. John; Nuneham; Stokenchurch; Bagley, Pusey, and very 
fine at Aldermaston, Berks. 
O. leiocarpum, Br. & Sch. 
Trees ; rare and always sparingly. March. Wychwood Forest; Bladon 
Woods; Bullingdon ; Stokenchurch ; Henley; Bagley Wood. 
CALYMPERIDZ. 
ENCALYPTA, Schreb. 
E. vulgaris, Hedw. 
E. extinctoria, L. 
Old walls, banks, etc., chiefly such as are calcareous; frequent. March, 
April. Heyford; Woodstock; Witney; Chipping Norton; Islip; Bays- 
water ; Shotover, etc. Hincksey and Cumnor, Berks. 
E. streptocarpa, Hedw. 
Calcareous banks, limestone or mortared bridges, especially over streams. 
Spring. Much more rare and without fruit. Near Kirtlington; old 
