58 LICHENOLOGICAL MEMORABILIA. 



Leight., sparingly. Pannaria triptophylla, (Ach.), sterile, and 

 Pannaria plumbea, (Lightf.), in most luxuriant fruit, abounded on 

 the trees. In Lecanora the following occurred, expallens, Ach., 

 tartarea, L., f. grandinosa, Ach., ventosa 7 L., sulphur ea, Hffm., 

 very perfect, Dicksojiii, (Ach.), subfusca, L., f. allophana, Ach., 

 abundant and fine. Pertusaria yielded communis, D.C., and leio- 

 placa, (Ach.), but a few specimens of the uncommon Phlyctis 

 argena, (Ach.) were met with, and Thelotrema lepadinum, Ach., 

 in tolerable quantity. Lecidea sanguineo-atra, Ach., was abundant 

 on one or two elms, Lecidea pineti, (Schrad.), at the bases of Scotch 

 firs. This lichen has been now ascertained to be identical with. 

 Peziza diluta, Pers., and it must consequently henceforth bear the 

 name of Lecidea diluta, (Pers.). Its synonymy is Peziza diluta, 

 Pers. Syn. 668 (1801) ; Lichen pineti, Schrad. in Ach. Meth. 68 

 (1805); Biatorina pineti, Mass. Ric. 135; Korb. Syst. 189, Par. 

 136; Biatorina diluta, Th. Fr. Lich. Arct. 185; Lecidea pineti, 

 Leight. Lich. Fl. 317— and Exsiccati, Rabh. 906. Zw. 83. Mudd. 

 145., Hepp. 136., Nyl. 56. Schasr. 218. Leight. 89. A few very 

 poor specimens of Lecidea panceola, Fr. ; L. myriocarpa,T).G.', 

 one or two bits of L. carneola, Ach. ; and on the rocks, but rare, 

 a Lecidea altogether identical with a specimen in my herbarium from 

 Dr. Lahm, of Buellia occulta, Korb. Par. 186, collected near Heidel- 

 berg, by Von Zwackh. As this has never before been noticed in 

 Britain, I add its characters : — 



Lecidea occulta. (Korb.)— Thallus pallido-lutescent, effuse, ad- 

 nate, thin, minutely areolate, areolae somewhat convex ; hypothal- 

 lus dark ; apothecia very minute, adnate, nigro-fuscous, at first 

 margined by the thallus, eventually free and somewhat convex, 

 proper margin more or less visible; epithecium fuscous; para- 

 physes indistinct ; hypothecium lutescent ; spores 8, fuscous, small, 

 oblong, 1- septate. 



Thallus tinged yellow with K, and on immediate subsequent 

 application of C still yellow, but soon obliterated (Ky C — ). It 

 may be well to state that my herbarium contains a similar lichen 

 gathered at Diganwy, near Conway, in 1851. 



See plate 4, fig. 6, a thallus nat. size, b section of apothecium, c 

 spores, magn. 1200. 



This Lecidea bears a considerable general external resemblance 

 to L. stellulata, Tayl, but that has a white thallus, and a dark 

 hypothecium, and different reaction, keeping them distinct. 



A very interesting and instructive series of forms of Lecidea 

 resince, Fr., occurred on the resin issuing from the spruce fir-trees. 

 Its normal condition may be seen in plate 4, fig. 9 a, in which the 

 apothecia were pale yellowish-brown, adnate and plane, variable in 

 size. A section of the apothecium (fig. 9, f. & d.) showed a pale 

 yellow hypothecium, with a darker yellow hymenium, consisting of 

 distinct slender paraphyses, and linear asci, containing innumerable 

 spherical colourless spores (fig. 9, i. & h.) The spermogunia were 



