214 DR. LINDSAY ON THE SPERMOGONES AND 
brownish, triangular, or chink-like, never round and regular. Spermatia abundant, as 
very small straight rods, 54554 long and 35:555 broad. 
Specimen 9. On granite rocks, Mt. Hohneck, the Vosges: Schærer’s Exs. no. 541 
(sub nom. Parmelia parella, var. tartarea, subvar. saxorum). The spermogones are 
seated in warts external to the region occupied by the apothecia. The ostiole is pale 
brown, distinet, semitranslucent, with frequently a pale subtumid thalline margin. The 
spermogones thus resemble (externally) young apothecia. The spermatia are straight 
rods zopp to 5550 long; the sterigmata linear, short, subsimple, about 1555 long, some- 
times with obscure appearance of (a few) articulations. 
Specimen 10. Dalmahoy Hill, near Edinburgh, June 1856, Dr. Murray Lindsay: in 
fruit. The spermogones are scattered externally to the region of the apothecia as distinct 
tubercles of the same colour as the thallus, irregularly rounded, with pale brown ostioles 
seldom regularly round, generally stellate-fissured. No spermatia were seen. The 
rugose and warted thallus is a favourite nidus for insect ova, which are sometimes de- 
posited in myriads, so as to blacken or otherwise discolour the thallus or apothecia. 
Whatever, however, be their colour, they are much too numerous, too superficial and 
easily removable, too regular in size and form, to be mistaken for spermogones of the 
Lecanora. Their structure under the microscope further distinguishes them. 
Specimen 11. Variolaria corallina, Ach.: Carmichael (probably from Appin, Argyle- 
shire): in Herb. Kew. It seems an isidioid-sorediiferous state of var. frigida. The plant 
consists of large irregular pillar-like isidia, many of them spermogones, tipped with pale 
brownish-yellow points (— ostioles), the others being erowned with tuft-like or brush- 
like soredia. 
Species 3. L. GLAUCOMA, Ach. 
Specimen 1. Haughmond Hill, Shropshire, apparently on basalt: Leight. Exs. no. 53 
(sub nom. Parmelia glaucoma). 'The spermogones are abundant on the periphery of the 
thallus and about the black zigzag boundary-lines separating or marking contiguous 
thalli, in the left-hand specimen in my copy. They are also, however, scattered over 
the whole thalline surface. They are mostly immersed, the ostiolar surface being flat or 
subdepressed, most frequently the former; sometimes, though seldom, they are tubercu- 
liform. Under moisture and under the lens, in all cases, the ostiole becomes apparent 
as a small pale-brown subgelatinous body, round, or (in age) irregularly fissured, with a 
corrugated thalline border, which is frequently pale, mealy, subprominent, and irregular. 
Under moisture, also, ostioles which are flat become subpapillar. In the dry state the 
ostiole is frequently simply of a somewhat deeper grey colour than the thallus. Some- 
times the spermogones are confluent. Generally there is one on each of the thalline 
scales or areolze: or two or three (seldom more) may occur on the same areola. They 
resemble sometimes pores or perforations in these thalline scales, and have very much the 
external characters of those of Lecidea fusco-atra, than which, however, they are larger. 
The commonest form is that in which the ostiole is depressed. The spermatia are much 
longer and thicker than in L. subfusca; like them, curved or twisted; about opo long, 
seated on sterigmata, which are simple vesicles. 
