OF FILAMENTOUS, FRUTICULOSE, AND FOLIACEOUS LICHENS. 213 
of the ordinary kind occur here; but on the margins of the lobes is seated a series 
of very large black cones, which resemble a fringe of coarse teeth. Some are 
rather barrel-shaped than papilleform; most of them are broad and short, 
and all have distinct ostioles. The spermatia are rod-shaped, about znth long, and 
santh broad. The sterigmata are about ath long, and zqth broad ; they are very 
| delicate, are composed of 5 or 6 delicate cylindrical articulations, and are with diffi- 
culty seen amid the dense, intertangled mass of sterile, elongated, anastomosing 
filaments, which project from among and far beyond them and fill up the 
cavity of the spermogone. The latter filaments resemble those of P. sazatilis, P. 
physodes, and many other Parmelias ; but they are usually much more abundant, 
and they branch and anastomose in all directions. The thallus bears apothecia ; 
the under surface and sometimes the margin are sparingly fringed with long 
black fibres. The spermogones here resemble those of Platysma, though the sterig- 
mata, spermatiferous and sterile, differ somewhat. Were it not that in the two 
following specimens these spermogones are found associated with the ordinary 
spermogones of P. perforata or P. perlata, there might be some difficulty 
in deciding whether this plant belongs to Platysma or Parimelia. As it is, I 
have no hesitation in placing it here. ‘The spermogones vary greatly in regard 
to size and closeness of apposition; hence they form a most irregular fringe or 
margin. 
Specimen 7.—Var. denticulata, Munklow, Khasia, India; sub-tropical region, at 
4000 feet; coll. Drs Hooxer and Tuomas Tuomson. ‘This appears to be a transition 
form of great interest, inasmuch as, in addition to the large barrel-shaped mar- 
ginal spermogones described in No. 6, it possesses black punctiform spermogones 
of the ordinary kind, dotted about the margins of the lobes. The plant bears 
_ apothecia; the margin of the thallus is slightly ciliate, and, but for the barrel- 
shaped spermogones, the plant has all the appearance of P. perlata. 
Specimen 8.—Var. denticulata, Nepaul; in Herb. Hooker, Kew; a very large 
and handsome plant. Like No. 7, this possesses both forms of spermogones, the 
barrel-shaped ones being among the largest and most distinct I have ever met 
with in lichens. Besides occurring on the margins, however, they are occasion- 
ally studded on the flat surface of the lobes, near their margins. The spermatia 
and sterigmata are precisely as in P. perlata. 
Species 4. P. crinita, Ach. 
Specimen 1.—Sicily Island, Ohio, U. S., America, Peck; in Herb. Hooker, 
Kew. This plant also seems to me referrible to var. ciliata of P. perlata; its 
lobes are fringed with beautiful long, delicate, black fibres. The spermogones 
are abundant, as they are in all extra-European forms of P. perlata and its con- 
" geners. 
VOL. XXII. PART I. 31 
