LICHENS OF HATFIELD FOREST
167
P. saxatilis (L.) Ach.
P. sulcata Tayl.
P. dubia (Wulf.) Schaer. (= P. borreri Turn.)
Hypogymnia physodes (L.) Wats.
Lecanora dispersa (Pers.) Rohl.
L. chlarotera Nyl. f. rugosella (Zahlbr.) Poelt. (= L. rugosa (Pers.)
Nyl.)
L. symmicta Ach. var. symmictera (Nyl.) Zahlbr.
L. symmicta Ach. var. aitema Nyl.
L. expallens (Pers.) Ach.
L. conizaeoides Nyl. ex. Cromb.
**Ochrolechia subvirdis (Hoeg) Erichs.
Lecidea scalaris Ach. (= L. ostreata (Hoffm.) Schaer.)
L. granulosa (Ehrh.) Ach.
L. uliginosa (Schrad.) Ach.
*L. lucida Ach.
Pertusaria amara (Ach.) Nyl. (= P. faginea (L.) Leight.)
P. coccodes (Ach.) Nyl.
Lecania syringea (Ach.) Th. Fr.
Haematomma coccineum (Dicks.) Koerb.
Caloplaca pyracea (Ach.) Th. Fr.
Candelariella vitellina (Ehrh.) Mull. Arg.
Physica grisea (Lam.) Zahlbr.
P. adscendens (Th. Fr.) Oliv. sensu Bitt.
P. caesia (Hoffm.) Nyl.
P. orbicularis (Neck.) Poetsch.
Xanthoria parietina (L.) Th. Fr.
Rinodina demissa (Koerb.) Arn.
Buellia myriocarpa (DC.) de Not.
Diploicia canescens (Dicks.) Massal.
Cladonia chlorophaea (Florke) Spreng. (= C. pyxidata (L.) Hoffm
var. chlorophaea Florke).
C. coniocraea (Florke) Spreng.
C. cornutoradiata Coem.
C. furcata (Huds.) Schrad,
C. rangiformis Hoffm.
**C. squamosa (Scop.) Hoffm.
**C. parasitica Hoffm. (= C. delicata (Ehrh.) Florke).
**C. floerkeana (Fr.) Sommerf.
C. macilenta Hoffm.
NOTE: —Species marked with asterisks are new county or vice-county
records, the double mark indicating that a specimen has been
determined by Mr. P. W. James and deposited in the British
Museum (Natural History). My grateful thanks are due to
Mr. James for determining these and certain other specimens.
This list exceeds by some ten species the one published in 1924.
About fifteen species are common to both lists (this includes Physcia
adscendens which was probably referred to by the name 'P hispida').
It exceeds the 1890 list by nine, but there are only about nine species