KNIGHT AND MITTEN ON NEW ZEALAND LICHENS. 105 



plane, margin defined by a narrow line, deep-brown, almost black ; spores 1-septate, 

 oblong, light yellow, measuring from 0*0002 to 0*0006 of an inch. 



Hab. On bark, Auckland. 



Pl. XII. fig. 29. a. section of the thallus and apothecium; b. theca; c.apothecia as seen from above. 



This species differs from the following in its clavate thecse. In the other New Zealand 

 species they are turbinate or pyriform, and the spores disarranged. In A. liirlda Ach., the 

 spores are one-septate, measuring from 0-00018 to 0*00050 of an inch ; but the apothecium 

 is roundish and convex above. 



A. INDISTINCTA, K. & M. Thallus grey, thin ; apothecia ii-regularly elongato-oblong, 



simple or branched, margin ragged and obscure ; epithecium greyish-black, convex ; 



spores 3-septate, oblong, constricted in the middle, terminal cells much the smallest, 



light yellow, measuring from 0*0004 to 0*0010 of an inch. 

 Hob, On bark, Auckland. 



The apothecia to the naked eye resemble small black specks ; when magnified, they 

 appear at their margins to fade into the thallus. 

 Pl. XII. fig. 30. a. section of thallus and apothecium; b. theca; c. spores; d. apothecium as seen from 



above. 



A. ALBiDA, K. & M. Thallus white or dull white, smooth ; apothecia prominent, ii-regu- 

 larly lobed or angular, with a thin erect thallodal margin ; epithecium lilac-brown, 

 pulverulent ; hypothecium pale, but a black spot sometimes present at its sides ; 

 spores 3-septate, obovate, yellow, upper cell the largest. 

 Hab. On smooth bark, Auckland. 



Thallus nearly white, fading away at the margin like the mycelium of a fungus ; apo- 

 thecia evenly dispersed over the thallus, of a dull lilac-brown. In general appearance 

 this species resembles A. cinnaharina, "Wallr. ; but the apothecia are smaller, and there 

 is no trace of the red exudation. A. cinereo-pruinosa, Schaer. {A. blformis), Lich. Helv. 

 Exsic. No. 251, has roundish or irregularly oblong, not angular apothecia, and the spores 

 reddish-brown, measuring from 0*00020 to 0*00052 of an inch. 



Pl. XII. fig. 31. a. section of the thallus and apothecium ; b. theca ; c. spores ; d. outline of the apothecium 

 as seen from above. 



A. EAMULOSA, K. & M. Thallus dull white, very thin ; apothecia superficial, black, with 

 a dark-brown base and sides, much branched, bordered by a narrow undulating line ; 

 spores 3-septate, oblong or obovate, brown, upper cell the largest, measuring from 

 0*00020 to 0*00015 of an inch. 



Hab. On wood, Auckland. 



Apothecia more branched than those of A. astroidea, Ach., and more prominent. 



Pl. XII. fig. 32. a. section of the thallus and apothecium; b. theca; c. outhne of the apothecium as seen 

 from above. 

 VOL. XXIII. P 



