260 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
in, and surrounded by, the white medullary tissue. The cortical envelope is not 
of a deeper tint than the rest of the tissue of the spermogone. The cavity is 
irregular, and is divided into numerous sinuses or anfractuosities which are 
marked externally by bulgings of the walls of the spermogone. The sterigmata 
are simple, resembling those of Lecanora subfusca. The spermatia are very deli- 
cate, filiform, and much curved ; their length is about th to ;th, with a breadth 
of ssqith: 
SpEeciIES 2. S. chrysoleuca, Sm., 
A beautiful species, which grows in Europe, North America, and the Himalayas. 
Specimen 1.—ScuHmRER exs. 345 (sub Parmelia rubina a. chrysoleuca); on 
micaceous rocks, in the Southern Alps. On the right-hand specimen in my copy 
(original ed. 1840), there are a few old spermogones, containing no free spermatia ; 
they are punctiform, seated on the tips of small, isidioid warts, and are marked 
by inconspicuous ostioles. On the left-hand specimen, mature and young sper- 
mogones are scattered over the surface of lobes bearing no apothecia. They are 
wholly immersed, and are marked by round black, or bluish-black, ostioles. They 
closely resemble the spermogones of the preceding species. The spermatia are 
long, filiform, and curved or twisted, about sath long, and synth broad. The 
sterigmata are simple, linear, elongated, measuring, with the spermatia attached, 
hs 
SpPeciES 3. 8S. sawicola, Ach., 
A cosmopolite. The thallus frequently consists of an aggregation of small, irre- 
gular, dark-gray scales. On these the spermogones are scattered as small black 
points, without appreciable prominence. The body of the spermogone is spherical, 
with a diameter of about jth, of a brownish-violet colour externally, as well as 
internally. The cavity is simple; the sterigmata are also simple, narrowly linear, 
almost solid from thickening deposits on their interior; their length is about ;,th 
to sth; their breadth scarcely mele The spermatia are filiform and curved, 
about wath to gath long. 
Specimen 1.—ScHARER exs. 332 (sub Parmelia muralis a. ochroleuca); on 
limestone, Switzerland. The spermogones are small black papillz, seated on 
separate, sterile scales of the thallus, chiefly at the corners thereof, asin Lecanora 
cinerea and many Lecidee. The spermatia are sub-ellipsoid, ith long, and 
»onth broad, seated on the apices and sides Of arthrosterigmata. The spermatia 
and sterigmata show that this plant certainly does not belong to our S. saxicola, 
however much it may outwardly resemble it. 
Species 4. S. concolor, Ram. 
The black warts on the apothecia, of which Scu rer speaks, are spermogones. 
The spermatia are among the most slender, longest, amd most beautiful known 
among lichens. Their length is th; theirbreadth from sath to sacth. 

