242 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
The spermatia are rod-shaped, and about th long, with a breadth of zi,th 
seated on articulated indistinct sterigmata. 
Specimen 2. —Torquay, 1812 ; in Herb. Hooker, Kew. In this, as in all English 
specimens I have seen, the laciniz are short, stout, and broadish ; the spermo- 
gones are rare, and the apothecia never found. 
Specimen 3.—Var. contracta, Nyl. (Syn. P. echinata, Tayl.); in Herb. Hooker, 
Kew. Here also the lobes are short and broad. The spermogones are abundant 
as brown warts or papillee, about the ends, and on the convexities, of the grayish 
or whitish lobes. Most of the foreign specimens of P. lewcomela, in Herb. Hooker, 
are referrible to NYLANDER’s var. angustifolia, M. and Flot., which he describes as 
occurring only in equatorial America, St Helena, and the East Indies. 
SPECIES 3. P. speciosa, Fr., 
Which occurs in Europe, Africa, America, Asia, Polynesia, and Australia. This 
plant may be considered, in regard to its general aspect, as intermediate between 
P. leucomela and P. stellaris, though it more closely resembles the latter than the 
former. Its spermogones are for the most part those of the lJatter,—of which, 
indeed, I am inclined to consider P. speciosa a variety. . 
Specimen 1.—ScHLEICHER’s exs. No. 47, 1815; on the trunk of Prunus avium, 
Nepaul. The spermogones are those of P. stellaris. They are black, prominent 
papillze, seated on the convexities, and about the ends, of the lacinize, sometimes 
isolated, sometimes in closely aggregated groups. A specimen from Caracas, Brr- 
SCHELL, is precisely the Irish form of the plant as sent me by Mr CarroLu. There 
are no apothecia; but spermogones are abundant. Mauritius specimens have 
the spermogones brown, very small and inconspicuous, wholly immersed. In 
those from Jamaica, Dr Wricut, the lacinie are large and cream-coloured, and 
the spermogones bluish-black, and distinct from the contrast of their colour with 
that of the thallus. In those from Madras, the laciniz or lobes are large, waxy, 
and pale, and the spermogones few, large, and black. All the above specimens 
are in Herb. Hooker, Kew. 
Specimen 2.—(Sub P. diadenata, Tayl.); Madras, Calcutta, Singapore, Nepaul, 
Jamaica; all in Herb. Hooker, Kew. This is a very handsome form of the plant, 
peculiar to hot climates. The spermogones occupy precisely the position they do 
in P. stellaris, A few are grouped together about the ends of the laciniz, as small, 
brown papille. 
Species 4. P. Domingensis, Mont. non. Ach., 
Which occurs in America, Asia, and Polynesia. It seems to me also a mere form 
of P. stellaris ; their spermogenes are quite the same. 
Specimen 1.—Cuba, ex. Herb. Mont.; in Herb. Hooker, Kew. The spermo- 
gones are grouped on the convexities of the laciniz; they are usually brown, 
punctiform, and immersed. Sometimes they are confluent, and then they become 

