410 DR LAUDER LINDSAY ON THE 



thallus ; large, prominent, and sub-papillate ; seated on, or immersed in, minute 

 thalline wartlets or elevations. They become, moreover, with age occasionally con- 

 fluent and difform, frequently irregularly stellate or radiate (fig. 3 b). Generally 

 speaking, corticolous forms of P. perforata are abundantly, while saxicolous ones 

 in Otago are sparingly, spermogoniferous. In the former, spermogones sometimes 

 abound to such an extent as to give the thallus, to the naked eye, a black-punc- 

 tate character. 



The constituents of the hymenium of A . Curreyi (fig. 4 a d), are somewhat in- 

 distinct, from their state of close aggregation. The tips of the paraphyses are 

 dark-brown (b\ very granular, and agglutinated ; and they are covered by a 

 colourless epithecial membrane (a). The hypothecial tissue is also ve^ granular 

 and dark (d). The thecoe (c) are of the typical form, -0012" long, and -0006'' broad,* 

 containing eight spores arranged in one or two rows. In the young state, and 

 while crowded in the thecte, these spores are generally sub-angular or otherwise 

 difform from mutual pressure (c). The thecal lichenine gives a beautiful blue 

 reaction with iodine ; in this respect resembling A. oxysporus. The spores (fig. 5) 

 are simple, colourless, sometimes showing a double contour, -0003'' long, and 

 •00025'' broad ; broadly ellipsoid or sub-oblong ; sometimes slightly curved like 

 those of the genus Ramalina ; and also, like them, sometimes exhibiting a tendency 

 to central division into two loculi (a), with occasionally a slight constriction 

 opposite the septum. The spores thus resemble those of A. oxysporus, rather 

 than those of A . Smithii, which are brown, solseform, and 1-septate. The ten- 

 dency, however, to division and constriction is an approach to the characters of 

 the latter. They are always much smaller, broader, more rounded at the ends, 

 or more oblong, than those of A . oxysporus. With this species I have associated 

 the name of my friend, the eminent Fungologist, Fred. Currey, F.R.S. 



2. A. oxysjjoms, Tul. (fig. 6), 



also occurs in Otago, apparently identical in its characters with its Scotch proto- 

 type.! I found it parasitic on the larger-lobed forms of Parmelia conspersa, Ach., 

 which grow plentifully on basalt, in the gullies or glens of the Greenisland hills 

 {e.g., near Greenisland church). The apothecia are typically flattish or discoid; 

 in the young state, however, they are frequently tuberculiform or sub-papillse- 

 form ; and under moisture, in the mature condition, they swell so as to become 

 sub-convex, and to assume somewhat the characters of those of A . Smithii and 

 A . Curreyi. In the old state, generally from the falling away of the hymenium, 

 they leave a black urceola, which may become irregular in its outline, or stellate- 



* The microscopical analyses were made with a Nachet's microscope : objective \", ocular, 

 No. 3 — magnifying 425 diam. -linear ; and the measurements here given are in decimal fractions of 

 the English inch. 



f " Monograph of Ahrothallus," p. 80; " Memoir on Spermogones," p. 232-3. 



