150 DR LAUDER LINDSAY ON THE SPERMOGONES AND PYCNIDES 
are much notched. Scattered along the notched edges, especially towards the 
extremities of the branches, and on their under or pale surface, are the sper- 
mogones, which are round, black, flattened warts. In some, the ostioles are small 
or imperceptible, more generally they are distinct, and frequently they are so 
large and patent that the spermogones have the aspect of mere rings. Some- 
times the body of the spermogone falls out, leaving an irregular saucer-shaped 
cavity. In foreign specimens, this species is very distinct from S. coralloides in 
the aspect of its thallus, and in the character of its spermogones, at least as to 
their external appearance and site. But in British specimens this is less evident ; 
most British specimens of S. compressum, so-called, are, however, really referrible 
to S. coralloides. The spermatia of |S. compressum are sub-oblong or rod-shaped, 
sometimes sub-ellipsoid, generally obtuse at the ends, about smth to month long. 
They are borne on the apices of extremely delicate, linear, simple sterigmata, ra- 
mose at the base, and resembling those of Cladonia. The spermogonal walls, in- 
ternally, give rise, in addition, to a number of ramose, elongated, anastomosing 
filaments, like those of Ramalina. 
Specimen 2.—Lord Auckland Islands, Antarctic Expedition, 1839-43, Dr 
Hooker; in fruit. The spermogones are the same as those which occur in Tas- 
manian specimens, and described in No.1. They are chiefly scattered on ramules 
destitute of apothecia; but they also occur, to a minor extent, on the small ra- 
mules, which frequently come off below the apothecia. The envelope is of a bluish 
cellular tissue. The sterigmata are extremely delicate and indistinct, and branch 
only from the base. Ramose elongated filaments are very abundant, filling the 
cavity of the spermogone. The spores are those of S. coralloides. 
Specimen 3.—New Zealand; Auckland Islands, Dr Hooker; Van Dieman’s 
Land; Tasmania, Gunn; in Herb. Hooker. The spermogones are always scattered 
over the under pale or channeled surface, where there is a distinction between 
the two surfaces. There would seem to be a gradual transition between S. coral- 
loides and S. compressum, in regard to the character of the ramules and spermo- 
gones. 
Specimen 4.—Port Famine, in Herb. Royal Botanic Garden, Edinburgh, is 
beautifully studded over with very distinct spermogones. 
Specimen 5.—Connemara, 1805, Dr Mackay; Miss Hurcuins, 1810, probably 
also from Ireland; in Herb. Hooker, Kew. The thallus is pale and waxy, and the 
spermogones are undoubtedly those of S. compressum. As a general rule, they 
are more abundant in this species than in S. coralloides. Korper, indeed, seems 
to believe that they never occur in the latter ; at least he remarks, “ Spermogo- 
nien sind bis jetzt nur bei S. compressum aufeefunden worden.” 
Spectinen 6.—North-west America. Spermogones scattered, few, isolated 
about the angles and end of the sterile ramules; Cotopaxi, JAmMEson; Jamaica, 
Purpie; New Granada, Purpie; Cape Horn, Dr Hooker, sterile specimens: 

