E É 
224 à DR. LINDSAY ON THE SPERMOGONES AND 
Specimen 7. Var. aitema, Sch. On Pinus sylvestris, in marshy parts of the Lóhr, 
Switzerland: Scher. Exs. No. 327 (sub nom. Parmelia varia, var. denigrata). Spermo- 
gones are small, black points on separate thalline wartlets. Spermatia and sterigmata of 
the type. 
Specimen 8. Var. aitema, Sch. On decayed wood, Switzerland: Scheer. Exs. No. 544 
(sub nom. Parmelia varia, var. sarcopis). Spermogones occur on the left-hand specimen 
in my copy (original edition, 1847) as small, brown, indistinct points (=ostioles) crown- 
ing separate thalline wartlets. Spermatia about 3555 long, smaller, therefore, than 
usual, curved, but seldom twisted or vermiform. 
Specimen 9. Var. aitema, Sch. On bark of pines and firs, Switzerland: Hepp No. 191 
(sub nom. Lecanora maculiformis, var. denigrata, Fr.). Spermogones are abundant on the 
left-hand specimen in my copy as small, black points, crowning the white granulations 
of which the thallus is made up, occurring both by themselves and scattered among 
the apothecia. Spermatia are in myriads, atomic in size, rod-shaped or oblong. Sterig 
mata differ considerably in character: in some conceptacles they are very short and sub- 
simple, while in others they are long, very delicate, and composed of many short sub- 
oblong articulations. The envelope or wall of the conceptacle is of deep-brown cellular 
tissue. There would thus appear to be here 2 forms of spermogone, both differing from 
those of the type—the spermatia being alike in both forms, but the one having simple 
sterigmata, the other arthrosterigmata. 
Specimen 10. Var. aitema, Sch. On the decorticated trunks of trees in the valley of 
the Lauen, Bernese Alps: Scher. Exs. No. 619 (sub nom. Lecanora varia, var. atro- 
cinerea, Sch.). Spermogones are pale tubercles like young apothecia, scattered among the 
black or deep-brown apothecia of the Lecanora; ostioles brown. Spermatia subellipsoid, 
about 5565 tO 5000 long, seated on very short, simple, linear sterigmata. Basal cellular 
tissue deep brown. 
Species 11. L. POLYTROPA, Ehrh. : 
Specimen 1. On granitic rocks, Swiss Alps: Scher. Exs. No. 572 (sub nom. var. 
intricata). The small sterile squamules of the young thallus in one specimen in my copy 
(original ed. 1849) are dotted over with spermogones, which are punctiform, wholly 
immersed, bluish black—when moistened, frequently dark blue or greenish-blue. Sper- 
matia are subvermiform, 51455 to 1557 long. Sterigmata with attached spermatia measure 
1000 $0 1459 long; are usually subspherical and simple, but consist sometimes of 2 or 
more artieulations. 
Specimen 2. Switzerland: Scher. Exs. no. 321 (sub nom. var. campestris). Spermo- 
gones are very small, inconspicuous, black and punctiform. Spermatia much curved and 
twisted, about 14455 to 1355 long (when stretched straight), and ¿5355 broad. Sterigmata 
simple, with attached spermatia measure about ¿55 long. Here, as in No. 1, both 
spermatia and sterigmata are those of varia, to which Nylander and oiher authors refer, 
and properly, I think, polytropa as a mere form. Polytropa has, however, like sulphurea 
and some forms of varia, equal title to rank as a Lecidea (quoad its apothecia). 
Specimen 3. On basalt, Blackeairn Hill, Newburgh, May 1858, W. L.L. Associated 
