254 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
irregular in form, scattered sparingly on the pale segments of the thallus. The 
spermatia are rod-shaped or sub-ellipsoid, smth long, and ;;th broad, on arthro- 
sterigmata, resembling those of P. parvetina. 
Specimen 2.— Var. Dickieana, mihi*—a plant sent me last summer by Pro- 
fessor Dickie of Belfast—appears referrible to P. villosa as a variety. It was 
gathered “ either on calcareous rocks in the Deer Park, or on the wall which sur- 
rounds it. The locality is on the north side of Belfast Bay, and about three 
quarters of a mile from the Bay” (in litt., 5th May 1858). It has not hitherto 
been known as a British plant. It is a dwarf, entangled form; the upper sur- 
face of the thallus is scarcely villose; the lacinix are grayish above, paler 
below and scarcely channelled or lacunose ; their margins are copiously fringed 
with short, irregular, white fibres. The apothecia are conspicuous, having a large 
saffron-coloured disk. The spermogones are very large and distinct as orange 
tubercles, seated near the ends of the lacinize, rounded, isolated, of similar colour 
to the apothecia. The spermogonal cavity is divided into sinuous compartments, 
as in P. ciliaris. The spermatia are rod-shaped, about ;anth to 4th long, and 
sth broad, seated on the apices and sides of long articulated sterigmata, resem- 
bling those of P. parietina. . 
SpEcIES 19. P. intricata, Scher., 
Which, like the preceding, is essentially a Spanish and Portuguese species, occur- 
ring also in England and in Africa. Its thallus somewhat resembles that of the 
preceding species: but the disk of the apothecium is black, instead of orange. This 
is the old Evernia intricata, Fries., the Borrera Atlantica, Ach., and Lichen Atlan- 
ticus, E. B. 1715, which grows sparingly on the south coast of England. 
Specimen 1.—Lancerotta, on old trunks of Opuntia jico-indica ; Teguire, 1846; 
coll. Bourgeau, No. 610;—both in Herb. Hooker, Kew. The spermogones are 
abundant, but they require to be carefully looked for with the lens, when the 
thallus is moistened. They are small brown points, scattered over the convexi- 
ties of the lacinize, or crowning a series of very inconspicuous small warts. The 
spermatia are rod-shaped, about sath long, and ath broad, on arthrosterigmata 
such as are found in P. villosa and P. parvetina. 
* Since this Memoir was originally presented to the Royal Society, I have had two communi- 
cations from Professor Dickie on the subject of the name of this plant. In his first (dated 25th 
March 1859), he says, “Twelve months ago I sent a Borrera, supposed by me to be a variety of 
Atlantica. I have now good reason to believe that it is new. Should you, therefore, publish any- 
thing on British species including it, I should wish it to stand as B. Hibernica, Dickie MSS.” In 
his second letter (dated 3d June 1859), he remarks, “The supposed P. villora, Dub., has been sub- 
mitted to Nylander, who pronounces it a monstrosity of P. chrysophthalma. I have compared the 
fruit in both, and find them identical, so we must bow to the high authority of Nylander.” In 
giving these criticisms, however, which I do in justice to Professors Dickie and Nylander, I see no 
reason for in any way modifying or altering my opinion regarding the place in classification or 
name of the plant in question—as above given. 

