256 DR. LINDSAY ON THE SPERMOGONES AND 
Species 24. L. EHRHARTIANA, Ach. 
Specimen 1. Apparently on palings, near Bury: Rev. G. R. Leathes : ex. herb. Turner, 
in the Kew herbarium. Apothecia and spermogones are associated, the latter as abun- 
dant, large, sublecidioid bodies, crowning irregularities of the thallus, very variable as to 
size, and irregular as to outline, generally greyish on the surface, or as if covered with 
a greyish bloom. The spermatia have, from their irregularity of outline, rather the 
aspect of stylospores, and they differ also in character from the spermatia that occur in 
other spermogones referred by authors to L. Ehrhartiana. They are here innumerable, 
romam subatomic in size, 413-555 X 30500 on very short, simple sterigmata, about 
sovo long. It is noteworthy that in this case the spermogones (if they are not rather to 
be considered pycnides) occur on the same thallus, and intimately associated, with the 
apothecia of the Lecidea. More generally the spermogones occur alone, on a thallus 
barren of apothecia; which led to their being ranked by the earlier authors in the hete- 
rogeneous pseudo-genus Pyrenothea. Spermogones and apothecia are associated in one 
or two other specimens in the Kew herbarium, e. g. :—in one in which the apothecia are 
immarginate, and closely resemble those of Lecanora varia; in another, in which the 
spermogones are both abundant and very large (from Suffolk), the collector's name not 
being given ; in one from Germany on old bark; and in specimens labelled * near Berlin, 
1815, Schzerer,”’ and ** Mr. Mohr, 1803." 
Specimen 2. Livermere, Rev. G. R. Leathes, 1807, sub Lichen graniformis, Hagen and 
Dickson, sent by Mr. Dickson. Here the spermogones occur alone; and the spermatia 
and sterigmata uana in character from those in the itd The spermatia are rod- 
shaped, 5566 X 30.009; On sterigmata which measure i555 to 3565 with spermatia at- 
tached, branch subdigitately at the base, and have very narrow or linear segments 
Specimen 3. On trunks of oaks, Switzerland: Scheer. Exs. no. 326, sub Parmelia varia, 
var. Ehrhartiana. The plant consists here solely of spermogones, which are black, 
one largish, and sparingly scattered. The spermatia are very minute rods, - 
50000 On short, simple sterigmata. 
Specimen 4. On old oaks, Switzerland : Scheer. Exs. No. 192, sub Lecidea corrugata 
Ach. Here, again, only Lue aeu a black, largish, very irregular in 
form. Spermatia are rod-shaped, 5555 X 35:55. on short, simple sterigmata. 
Specimen 5. On old palings, Switzerland: Hepp Exs. No. 228, sub Thrombium cor- 
rugatum, Ach. Two forms of spermogone here occur. The one series has the usual 
external character, with linear or subellipsoid spermatia, sometimes slightly curved 
always simple, and never 1-septate as Hepp figures them; the sterigmata short, linear, 
and simple; the basal cellular tissue of the sterigmata deep brown. In the second 
group the spermogones are quite different, both as to external character and contents : 
they are small, round, black, and punctiform, resembling grains of coal-dust scattered 
sparingly over the thallus. The spermatia are oval or spherical, atomic in size; on short, 
simple, linear sterigmata. Intermixed with the fertile sterigmata are long, ramose 
sterile filaments, projecting beyond theni, as in Ramalina, Parmelia and other genera* of 
the higher lichens. 
15,000 X 
* As figured in plates xi, and xii, of my first Mem. Spermog. 
