33 
colourless filaments—resembling the delicate colourless para- 
physes of Verrucaria—the analogues probably of the sterile 
sterigmata or filaments of the spermogonia of many true 
Lichens, e.g. the Parmelie. The terminal articulation of the 
spore-filaments generally contains one or more granular 
nuclei. 
(4) On roadside walls, between Spittal of Glenshee and 
Braemar; also collected by myself in August, 1856. Here the 
parasite is mostly punctiform, seated on the apices of the 
cones or papillz of the thallus,intermingled with the apothecia. 
The perithecia of the Spheria exhibit comparative uniformity 
of size and shape, appearing on the summits of the thalline 
cones as black, round, or stellate points or spots, girt by a 
sort of thalline exciple, which is variously regular or irre- 
gular, thin, or tumid and pertusarioid. The sporidia are 
brown, 2-locular or simple, broadly ellipsoid, oval, sub- 
spherical or figure-8-shaped, from constriction of the outer 
wall opposite the central septum.! ‘This form of the parasite 
agrees well with Mudd’s description of his Microthelia ven- 
tosicola (British Lichens, p. 307), which is undoubtedly the 
same Fungus. 
I found the spermogonia of L. ventosa more or less abun- 
dantly in my copy (1840, original edition) of Scherer’s 
Exsiccati,? No. 820, sub nom. Parme/ia ventosa, on left-hand 
Specimen: and also in the following specimens in the 
Kew Herbarium — (1) Braemar, 1844; (2) Clova (on 
rocks), 1843 and 1846, collected by Gardiner: (3) the 
Hartz mountains, Germany (on rocks), collected by Hampe, 
1846; (4) Mount Susten, Switzerland ; and (5) Devonshire. 
In all these cases they occurred as flattish, irregular, com- 
pound verruce, with sinuous cavities, and more or less 
numerous ostioles: generally as warts of considerable size, 
bluish or black on their surface, composed apparently—by 
confluence or union—of several simple perithecia. The 
sterigmata frequently branch sub-digitately from the base, 
though they are often also simple or nearly so. Nylander 
describes them, however, as only or always simple. They 
are often 001” to :00066” long. Sometimes in age (e.g. in 
Scherer’s Exs. No. 320) they assume an indigo colour, which 
is that also of the envelope or spermogonal walls. The sper- 
matia are always straight, and often about '00020” long. 
1 Vide “ Observations on W. Greenland Lichens,” p. 366, plate |, figs. 11 
and 12. 
2 Jbid., fig. 13. 
VOL. XIL—NEW SER. Cc 
