314 THE Joui{:;^AL of botaxy 



C. impexa Harm, is separated from C. sylvatica because its ulti- 

 mate branches are spreading and not recurved to the same side. 

 Frequent on the Somerset hills (5 & 6), Harlech (48), Beddgelert 

 (49), Delamere (5S), Skipwith (01). Form portentosa (Duf.) Harm. 

 Elworthy (o), Hisbury (8). Form pt/mila (Ach.) Harm. Blagdon 

 hill (5), Cannock Chase (39), Skipwith (61), Greenfield and Keigli- 

 ley (03). This form is better placed under C. imjjexa than under 

 C. alpestris which is softer and rather more intricately branched. A 

 scabrid state is frequent, and is probably due to age. On the Pennines 

 between Oldham and Fenistone the podetia are often almost black. 

 This blackening, which is shown by other vegetation, is chietly due to 

 the smoke from the neighbouring industrial district. 



C. uncicdis form aclunca (Ach.) Leight, Exmoor and Black- 

 downs (5), Snowdon (49), Skipwith (61), mountains near Killin and 

 Tyndrum (88), Ben 13oran (98) ; form turgescens (Del.) Cromb. 

 Snowdon (49), Killin hills (88), Ben Doran (98) ; form obiusaia 

 (Ach.) Nyl. On moist rocks, Cwm Glas (49), Killin hills (88), 

 form intef/errima Wain. Keighley (63) ; form dicroea (Ach.). 

 Nant-y-Ffrith (51), Kircubbin (Ireland 38 from T. Grlover). 



Thamnolia vermicidaris (Sw.) Schaer. On ground, 3200 ft., 

 Snowdon (49). 



Lecanactis ahieflna (Ach.) Krb. Broomfield (5), New Forest 

 (11), Mulgrave wood (62). The spermogoniiferous condition {Sphceria 

 leucocephala Pers.) has large spermatia, 12-16 X 3-4 yu,, and is more 

 fre(]uently found than the apothecial state. Another spermogonii- 

 ferous condition found on bark at Kingston (5) has smaller spermatia, 

 3-4x0"7-l^. The spermogonia are similar to those of L. abiefina, 

 the algal cells are in 3'ellowish chains, sometimes with orange-red 

 granules and it may be one of the Pyrenotheai described by Leighton 

 in his Angiocarpous Lichens. 



Arthonia litrida var. spadicea (Leight.) Nyl. On old oak, 

 Broomlield (5). 



A. radiata var. Swartziana f. simidans (Leight.). Near Taun- 

 ton (5). 



A. suhvarians Nyl. is parasitic on the thallus of Lecanora galac- 

 iina and is probabl}' a fungus. Staple Fitzpaine (5). 



Opec/rapha atra var. arlhonoidea Leight. Thurlbear (o). 



O. caJcarea iorm heteromo7yha (Stiz.) A. L. Sm. On sVdty rocks, 

 Morte Point (4). 



O. vidgata var. side?'ella (Ach.) Nyl. Cothelstone hills and Stoke 

 St. Mary (5). 



O. varia form tridens Ach. Staple hill (5), near Frome (6). 



G7v/phis elegans (Borr.) Ach. Yoy\\\ pared lela (Schaer.) Leight. 

 On birch and beech, Quantocks, Blackdowns and Exmoor (5), King- 

 settle hill (6). Form stcllata Leight. On holly and oak, Quantocks 

 (5), Longleat (6), near Bettwys-y-Coed (49). Form coacervata 

 Leight. On holly, Quantock hifls (5). 



G. scripta form stellata Leight. Red Lynch (6). 



Phceographls imistn (Ach.) Muell-Arg. Horner wood (0). 



Graphina Buiziana (Fee.) Muell-Arg. On birch near Tre- 

 borougli (5). 



