KNIGHT AND MITTEN ON NEW ZEALAND LICHENS. 103 



A browner- coloured species than the last, the thallus less warty, and the apothecia in- 

 distinctly marked out to the naked eye by a stained line ; when magnified, there is no- 

 thing, beyond the fissure, to be seen of the epithecium ; on making a transverse section, it 

 becomes evident that the stained aj)pearance surrounding the flssiu*e is due to the almost 

 black traces of the sides of the perithecium imbedded in the thallus, more evident in 

 some examples than in others. The thalamium is opaline, considerably dilated below, 

 and the epithecium deep brown. This species very closely resembles F. nitida, Mont., 

 and may be a form of that species ; but the spores could not be found in an authentic 

 specimen. 



PliATYGRAPHA, Nyl. 



P. MiCROSTiCTA, K. & M. Tliallus dusky grey ; apothecia round or oblong, flexuose, simple 

 or branched, broader at one end, ends rounded ; epithecium dark lirown ; hypothecium 

 black; spores fastigiate, fusiform, 3-septate, measuring from 0-00010 to 0'00140 of 

 an inch. 



Hab. On bark, Auckland. 



Tliallus everywhere covered at equal distances by the apothecia, which to the naked eye 

 resemble minute black specks. 



Pl. XII. fig. 23. a. section of thallus and apothecium ; b. theca; c. spores; d. apothecium as seen 

 from above. 



P. INCONSPICUA, K. & M. Thallus brown, with a slight lilac tinge when dry ; apothecia 

 very minute, roundish or oblong, with one end acuminate, immersed ; hypothecium 

 black ; epithecium contracted, l}lackish-brown ; spores fastigiate, not ? septate, fusi- 

 form, measuring from 0-00120 to 0-00175 of an inch. 



Hab. On bark, Auckland. 



This species seems remarkable for a dull lilac-brown colour. The apothecia are quite 

 invisible to the naked eye, and when magnified resemble black dots. The spores appear 

 to be without any trace of septa. 

 Pl. XII. fig. 24. a. section of thallus and apothecia; b. theca; c. spore. 



P. TUMZDULA, K. & M. Thallus dark yellowish-brown, somewhat swollen around the 

 elongate curved or short apothecia ; epithecium flat, irregular, bistre, defined by a 

 very narrow dark line ; hypothecium brownish-black ; spores fastigiate, fusiform, 

 measuring from 0-0001 to 0-0014 of an inch. 



Hab. On bark, Auckland. 



The colour of the thallus in the dried state resembles that of Lecidea pamsema. The 

 apothecia are conspicuous to the naked eye, and are very irregular in tlieir form and size. 

 The spores, like those of the preceding species, have no septa. 



Pl. XII. fig. 25. a. section of thallus and apothecium ; b. theca; c. spores; (1. apothecia as seen from 

 above. 



