LICHENOLOGICAL MEMORABILIA. 
85 
t. 2687, as probably true L. lygcea^ Ach.” It should be 
remembered that Mr. Borrer determined his lichens hy external 
characters alone, the confirmatory character of the spores being at 
that time scarcely thought of. 
I may here mention a fourth form collected in 1872 : — 
4. forma opegraphina. Leight. — Thallus obliterated; apothecia 
coacervate into gyrocarpous or opegraphine minute clusters. 
This form is precisely similar to that mentioned in Leight. Brit. 
Graph., p. 12, t. 5, f. Q a. h. 
Anglesea ! Rev. Hugh Davies, North Cliff, Tenby ! (1872), 
Cwm Ffynnon lloer ! Nant Francon. 
Lecanora Hutchinsiae. Nyl. — Goodwick Bay. Rare. (K — C — ). 
This beautiful lichen has been found hitherto only in Ireland and 
in Jersey. The spores are variable in size, and resemble a good 
deal those of Lecidea cyrtella, Ach., but that lichen may be recog- 
nized by the disk of the apothecium, when moistened with K, 
becoming pale and transparent, and surrounded by a thin external 
dark circumferential ring. 
Lecanora helicopis. Whlnb. — The spores of this very rare 
lichen resemble those of Verrucaria gemmata, Ach. It has only 
been found once before in Ireland, and now occurs very sparingly 
in Goodwick Bay. 
Lecidea mesoidea. Nyl. — This curious lichen occurs very 
sparingly in Goodwick Bay. It has been once before found in the 
Channel Islands. The remarkable hypothecium well distinguishes 
it, consisting of a dark stratum immediately under the pale hyme- 
nium, then a large middle stratum of a pale reddish hue, which is 
subtended by a basal dark stratum. 
Lecidea parellaria. Nyl, — Parasitic on Lecanora parelia (L.), 
plentiful on the stone walls of the Road, Fishguard to Llanachar, 
and at Manoerowen, near Fishguard. This was originally dis- 
covered in France, and this year (1876J by Mr. Larbalestier in the 
West of Ireland. 
And the following, which are believed to be new species : — 
Lecidea impressula. Leight. — Llanachar Bridge. My Her- 
barium contains this also, from near Dolgelley. 
Lecidea imponens. Leight. — Parasitic on Lecanora polytropa. 
Fort Hill. 
Lecidea tephrizans. Leight.— Llanachar Bridge. 
Lecidea zyssolea. Leight. — Fort Hill. 
Lecidea glaucomazia. Leight.— Parasitic on Lecanora glau- 
coma. Goodwick Bay. 
Odontotrema majus. Leight. — On drift-wood, Goodwick Bay. 
Distinguished from 0. minus and 0. longius by the size of the 
