412 DR LAUDER LINDSAY ON THE 



The apothecia somewhat resemble externally those of L. grossa, Pers., and 

 L. pulverea, Borr. They are sometimes angular, or sub-lirellseform ; sometimes 

 sub-pedicellate. The hymenial gelatine and the thecre become beautifully blue 

 under iodine (fig. 7 c). Both hymenium and thecte also contain large quantities 

 of oil globules (b). The thecce (c) are somewhat small ; -0015" long, and •00045" 

 broad ; 8-spored, and of the ordinary form. The paraphyses are indistinct, and 

 the dark-brown clavate heads are closely agglutinated (a). The spores (fig. 8) are 

 •0012" long, and •00001" broad; acicular or very narrowly fusiform; colourless: 

 generally slightly curved ; poly-septate (frequently 3 to 5 septa) ; like the majority 

 of lichen-spores, granular in the old and young states (a), with no distinction oi 

 loculi or septa. 



5. L. flavido-atra, Nyl., Lich. N.Z., 257 (fig. 9). 



On stockyard palings of " Goai," Martin's Bush, Chain Hills. 



Externally it differs from L. grossa, Pers., L. marginiflexa, Tayl., and other 

 Lecidece, only by the colour of its thallus — a lemon yellow. 



The paraphyses are indistinctly seen, but are sub-discrete, delicate, filiform, 

 sub- hyaline, colourless even at their tips, which are not knobbed or clavate. The 

 thecce are large and distinct ; 8-spored ; •0030'' long, and 0015" broad ; giving a 

 beautiful blue with iodine. The spores (fig. 9) are broadly ellipsoid ; 1- septate; 

 colourless ; -0009" to 0012" long, and -0006" broad. In the young state {a) they are 

 polari-bilocular, and save as to colour resemble those of Physcia puherulenta, 

 Fr. In the young state (a) also, the septum is generally wanting, and the loculi 

 have a pale lemon-yellow tint. 



6. L. melanotropa, Nyl., Lich. N.Z., 255 (fig. 10). 



On trees and shrubs, Stoneyhill Bush ; and on the bark of dead trees, Saddle- 

 hill Bush ; associated with Arthonia excedens, Nyl., and Collema leucocarpam, Tayl. 



The apothecia in the young state are sometimes waxy or corneous, of a 

 glaucous or olive hue, becoming, however, with age pitch-black, and then resem- 

 bling those of L. grossa, Pers. 



The constituents of the hymenium are most indistinct, and the spores (fig. 10) are 

 with difficulty seen. The latter are globose or sub-globose ; 1-septate, colourless, 

 about 0003" in diameter. The hymenium and thecse give a blue reaction with 

 iodine. 



7. L. amphitropa, Nyl., Lich. N.Z., 256 (fig. 11). 



On rocks and the ground, Woodburn Ravine, Saddlehill. 



The plant consists of a patch of white thallus, with a very few straggling 

 black apothecia, resembling in general aspect our L. epigcea, Schser., or L. Hookeri, 

 Schser. 



The constituents of the hymenium are indistinct and closely aggregated. The 



