210 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
Acharius, of Leight. exs. 112, and of E. B. t. 2423, seem to me referrible to P. 
perlata. The confusion between P. perforata and P. perlata is constant, and the 
only way to avoid this for the future is, as I certainly do, to regard the former as 
a mere variety of the latter. Specimens with perforate apothecia are not at 
all common in the so-called P. perforata, and even when they do occur, they are 
not peculiar to this species, but are found as an accidental condition in various 
Parmelias. The majority of specimens of P. perforata I have seen are referrible 
to var. ciliata of P. perlata. To the same variety of the same species I am in- 
clined to refer P. proboscidea, Tayl., “ Fl. Hib.,” 143... This Castle Bernard speci- 
men has spermogones of the usual type of those of P. perlata. 
Specimen 9.—Var. ciliata, SOHARER exs. 253 (sub Cetraria glauca B. fallax, 
Ach.); in woods on Mount Gurnigel, Switzerland. The spermogones are old, 
containing no free spermatia; they are dotted over the margin of the thallus. 
ScurER has here made the very common mistake of confounding P. perlata 
with Platysma glaucum, whose marginal spermogones, as well as spermatia and 
sterigmata, however, at once distinguish it. 
Specimen 10.—Var. reticulata, Tayl. (syn. P. reticulata, Tayl. “ Fl. Hib.” 
148.) Taytor’s plant seems to me partly referrible also to P. sinwosa. Dunkerron, 
Ireland; coll. Taytor, in Herb. Mackay, and named by Taytor himself. The 
plant is most variable; some of its lobes are broad and rounded, as in perlata ; 
others narrow and sub-linear, as in s¢mwosa. The larger lobes are ciliate, precisely 
as in var. ciliata of P. perlaia; the smaller ones are frequently tipped with 
soredia as in stmwosa and its var. levigata. The reticulations, which give the 
plant its name, are merely cracks or fissures of a thick, coriaceous, old thallus. 
The plant bears no apothecia; but its spermogones are sub-marginal, and as 
described in other forms of P. perlata. The same plant occurs also (collected by 
Taytor) in Herb. D. Moore, Glasnevin, Dublin. New Zealand specimens of 
Tayior’s P. reticulata in Herb. Hooker I refer rather to P. stnuosa. 
Specimen 11.—Var. letiformis, Fée (sub Parmelia), Cuba, ex. Herb. Montagne; 
in Herb. Hooker, Kew. This is a very curious variety, in which the thallus is very 
rugose and warted, as in P. caperata, chiefly centrally, but the warted condition 
extending also almost to the margins of the thallus. The apothecia are very abun- 
dant and crowded, but all are degenerate ; the disk has fallen out, and the saucer- 
shaped cavity which contained itis of the same colour and substance as the exciple. 
The exciple is thick and warted; and the apothecia, which vary much in size, 
resemble so many warts of the most irregular forms. The thallus and apothecia 
are indiscriminately studded over with black, immersed, punctiform spermogones, 
as frequently also happens in P. conspersa. The spermatia are rod-shaped, 
smth long and south broad. The sterigmata consist of cylindrical, somewhat 
irregular cells, articulated at very acute angles; they vary in length from th to 
wth, with a breadth of sath. : 

