230 DR. LINDSAY ON THE SPERMOGONES AND 
frequently grouped. Spermatia very minute rods, about zooo long, and 45-555 broad, on 
arthrosterigmata. 
Specimen 3. In Kew herb., labelled “ Dr. Scott, 1802,” without locality, but probably 
English; referred erroneously to Lecidea luteola. The apothecia certainly closely re- 
semble those of that Lecidea, being convex, the disk deep orange-red, and the border 
obliterated. Both spermogones and sporidia, however, are those of aurantiaca. 
Specimen 4. Var. salicina, Schrad. On rugged old bark, Newton, Cleveland, York- 
shire; Leight. Exs. No. 212 (sub Biatora aurantiaca, var.). Spermogones are abundant 
about periphery of thallus as small, round, orange-tipped tubercles, resembling young 
apothecia, but having no central opening. Spermatia are also very plentiful as minute, 
straight rods, borne on thickish arthrosterigmata, resembling those of Physcia parietina 
or Placodium murorum*. 
Specimen 5. Var. salicina. France, Mougeot, Scher. Exs. No. 537 (sub Lecidea auran- 
tiaca, var.). Spermogones abound, external to the region of the as as bright orange- 
red-tipped warts. Spermatia are very minute rods, apap ro 557 long, borne by arthro- 
sterigmata resembling those of Physcia parietina, 555 to 555 long. Parmelia micro- 
thelia, Ach. Meth. p. 174 (= Lecanora salicina, var., Ach. L. U. p. 401) is merely an 
abundantly spermogoniferous state of aurantiaca, or of one of its forms. 
Species 21. L. cALva, Dicks. 
Specimen 1. Var. irrubata, Ach., Leight. Exs. No. 213 (sub Biatora rupestris, var. 
irrubata). Spermogones are small, black, and punctiform, seated on the whitish thalline 
scales, which are easily detached, when moistened, from the stone on which they grow. 
Spermatia are atomic, seated on thickish arthrosterigmata. Associated with these sper- 
mogones is a parasitic microfungus, whose perithecia are small brown dots, seated on the 
same thalline scales. They contain both sporidiiferous asci and stylospores, growing 
together in the same hymenium, the sporidia and stylopores being similar in character 
—colourless, oblong-oval, 1-septate, or containing 2 or more polar nucleit. 
Species 22. L. CERINA, Ach. 
Specimen 1. Scher. Exs. No. 219 (sub Lecidea aurantiaca, var. cerina, subvar.). 
Spermogones occur in the upper specimen in my copy (ed. alt. immut. 1852) as small 
warts tipped with pale green, outside the region of the apothecia. Spermatia and sterig- 
mata are as in awrantiaca and ferruginea, the former being very minute rods, the latter 
arthrostigmata, distinct, irregular, with thick-walled cellules, showing double contour. 
Specimen 2. On young ash. Dunscombes Wood, Cork, Carroll; associated with 
Lecidea albo-atra. Associated with the Lecanora, but not necessarily belonging to it, are 
spermogones very different from those of the type. They are small, black, and puneti- 
form, the cavity being compound, consisting of two or more sinuous divisions. Sper- 
matia are straight and rod-shaped, 43655 long, and 43-355 broad, in great abundance, 
* As figured in my first Mem. Spermog. plate xv. fig. 2. 
t The parasite is more fully described in my ‘Observations on New Lichenicolous Micro-Fungi,’ p. 549, sub 
Lecanora pyracea, Ach. 
