228 DR. LINDSAY ON THE SPERMOGONES AND 
Species 17. L. TUBERCULOSA, Ach. 
Specimen 1. On bark of trees: Zier, in Herb. Menzies, Royal Botanic Garden, Edin- 
burgh (sub Lichen tuberculosus, Hoffm.). The plant appears to consist wholly of spermo- 
gones, which are large, white-pulverulent tubercles, like those of Lecidea abietina. I 
have, however, had no opportunity of examining them with the microscope. 
Species 18. L. FERRUGINEA, Huds. 
Nylander places this species, on account of its affinities, in the genus Lecanora; but 
such a classification is purely arbitrary and artificial, inasmuch as it has at least equal 
claims (quoad its apothecia) to remain among the Lecidee. Asa Lecidea it was regarded 
by Schærer and Hooker. 
Specimen 1. On silver fir, Ardrum, near Cork, Carroll, March, 1858. Thallus is whitish 
or pale grey, and smoothish. Spermogones are abundant outside the region of the apo- 
thecia as distinct, irregular, pale orange-red, wartlets, frequently grouped, sometimes 
confluent and then becoming very irregular in form. They are conspicuous on the white 
thallus, and are much paler than the apothecia, but both in colour and form they fre- 
quently resemble (externally) nascent apothecia. The spermatia are very minute, straight 
rods, 1500 long and 35-560 broad, seated on arthrosterigmata, whose constituent articu- 
lations are very indistinct—partly, at least, by reason of their minuteness. : 
The apothecia of the Lecanora are the seat of Pycnides, which are scattered over the 
hymenium just as Torula lichenicola* frequently covers the disk of L. subfusca. They 
are seated on the epithecium ; but their tissues extend downward between the paraphyses 
to the hypothecium, the hymenium of the Lecanora being 355 deep. The stylospores are 
figure-8-shaped, 1-septate, straight, or slightly curved, very pale olive or brown, 5555 
long and ¡5600 broad, seated on basidia that are short and simple, though sometimes (ap- 
parently) branched. Their ramosity forms an exception to the usual simple character of 
the basidia of pyenides, producing a resemblance to the sterigmata of many spermogones. 
The character of the stylospores is also exceptional as regards both colour and structure. 
The pyenides in question do not agree in character with those of Spheria ence 
Nyl. (Prod. p. 85), which is parasitic on the apothecia of L. subfusca. 
Specimen 2. On compact sandstone near Cork, Carroll; associated with Lata atro- 
alba, Flot. (which is L. stellulata, Taylor, Fl. Hibern. p. 118). Spermogones are pro- 
minent under the lens as brownish-red cones or papillse unassociated with apothecia. 
Spermatia are straight rods, 5555 long and 55:555 broad, on longish arthrosterigmata. 
Specimen 3. On slate, Crosshaven, Cork, Carroll, associated with Lecidea chalybeia, 
Borr. Thallus thick, white, and areolate or subpulverulent, becoming almost obsolete, 
approaching that of L. Lallavei. Spermogones are small, crowded papillæ, seated on ele- 
vations of (chiefly sterile) portions of the thallus, though they occur also scattered 
among the apothecia. Their colour varies pu pale pen dos to deep brown, or even 
black. Spermatia are very minute rods, 55-660 long and 55.555 broad, borne on arthro- 
sterigmata. 
* * Observations on new Lichenicolous Micro-Fungi,” Trans. Royal Society of Edin., vol xxv. pp. 515 and 
530, plate xxiii. figs. 1-18. 
