LICHENS AND FUNGI OF OTAGO, NEW ZEALAND. 413 



thecal are smallish, but give a distinct deep blue with iodine. The spores (fig. 

 11) are fusiform, colourless, 3-septate, '0009'' long, and 00015'' broad. 



8. L. leucothalamia, Nyl., Lich. N.Z., 255. 



On the bark of dead trees, Saddlehill Bush. 



Though the disk of the apothecium is generally whitish, its colour is variable, 

 being sometimes glaucous or brownish, with a corneous aspect. It resembles 

 somewhat L. melanotropa, Nyl., andZ. pulrerea, Borr., from which the spores, how- 

 ever, at once distinguish it. A similar pallor of disk occasionally occurs in 

 L. marginiflexa, Tayl., and other Lecidece, whose apothecia are typically and 

 usually pitch-black. The constituents of the hymenium are very indistinct and 

 closely aggregated. The hymenial lichenine becomes blue with iodine. Both 

 paraphyses and thecse are shortish ; I saw neither satisfactorily ; nor did I see 

 any spores. 



Var. melachroa, Nyl., which occurs in the same locality, is simply a form with 

 black apothecia, which then resemble those of L. marginiflexa, Tayl., L. grossa, 

 Pers., and many other Lecidece, with typically black apothecia. 



9. L. allotropa, Nyl., Lich. N.Z., 254. 

 On Mica slate, Glen Martin, Chain Hill Range. 

 There was no result of microscopical examination worthy of record. 



10. L. coarctata, Ach. ; var. exposiia, Nyl., Lich. N.Z., 254 (fig. 12). 



On tertiary grits and conglomerates, base of Saddlehill. 



The apothecia are mostly convex, resembling some forms of L. parasema, Ach. 

 Sometimes they are sub-difform, or irregular in outline. At other times they 

 exhibit remains of a coarctate or urceolate character, and they then resemble— as 

 does the thallus — some forms of Lecanora cinerea, L. 



The hymenium gives a very faint blue with iodine. The paraphyses are very 

 indistinct and closely aggregated ; they are obscured, especially about their tips, 

 by much granular matter of a deep reddish-yellow colour. The thecce ap- 

 proach in size and other characters those of Urceolaria and Pertusaria ; they are 

 •0030" to -0036" long, and -0006" to -0009'' broad. The spores (fig. 12) are simple, 

 colourless, ellipsoid-oblong, with double contour; frequently -0006'' long, and 

 •00045" broad. 



11. L. trachona, Nyl. ; var. marginatula, Nyl., Lich. N.Z., 254. 

 On columnar basalt, Greenisland Bluff. 



It has a general resemblance to various small forms of L lenticular is, Ach.. 

 L parasema, Ach., and L. contigua, Fr. 



The hymenium gives a deep blue with iodine ; the thecae and paraphyses are 



