106 KNIGHT AND MITTEN ON NEW ZEALAND LICHENS. 



A. AMPLiATA, Iv. & M. Tliallus grey, apotliecia scattered or arranged in a somewhat 

 parallel manner, roundish or oblong, partially veiled by the ruptured thallus, blackish- 

 brown ; spores brown, 5-6-septate, the upper cell much the largest, the adjoining and 

 sometimes all the other cells divided by a longitudinal septum, measuring from 

 0-0005 to 0-0013 of an inch. 

 Hub. On bark, Auckland. 



Thallus an inch or more in diameter, tliickly covered with the black-looking rather 

 large apothecia. Opegropha atra, y. obscura, Schser. Lich. Helv. Ko. 517, which has also 

 5-6-septate spores, is distinguished by its ochreous thallus and small yellow spores, mea- 

 suring from 0-00025 to 0-00065 of an inch, having their upper cell of the same size as 

 the lower. 

 Pl. XII. fig. 33. a. section of tliallus and apothecium ; b. theca ; c. spore. 



A. NiGRO-ciNCTA, K. & M. Thallus moderately thick, light brown or duU white, edged 

 by a dark line; apotliecia superficial, simple, irregular, roundish, oblong, bent or 

 curved, one end larger, blackish-brown ; spores obovate, 4-septate, light yellow, mea- 

 sm-ing from 0-00030 to 0-00081 of an inch. 

 Hab. On bark, Auckland. 



In a dried state, the thallus is of a whitish-brown colour with a tinge of lilac, the dark 

 margin wide and very evident ; it appears to form patches of an inch or more in diameter. 

 The apothecia are thinly scattered, their internal substance brown ; there is no dark mar- 

 ginal line as in most of the allied species. 

 Pl. XII. fig. 34. a. section of thallus and apothecium ; Z». spores. 



COLLEMA, Ach. 



C. CONTIGTJUM, K. & M. Thallus obscure green (when dry, black), consisting of tufted 

 complicate lobes containing moniliform green filaments ; apothecia small, close 

 together, arising just within the margin of the thallus, and projecting beyond it, pale 

 brown ; spores ellipsoid, multilocular, measuring from 0-0003 to 0"0008 of an inch. 

 Hab. On wood. New Zealand. 



The aspect of this species in the dried state is at first sight very similar to that of 

 Synalyssa symplioria, De Cand. ; bu.t on being moistened, it immediately becomes evident 

 that the numerous small apothecia arise from just within the edge of the erect or ascend- 

 ing entire lobes of a complicate thallus. In size, too, it resembles Collema micropliylhmi, 

 Ach., but is distinct from that species in its differently lobed thallus. 



Pl. XII. fig. 35. a. thallus (natural size) ; b. portion of thallus with apothecium in section ; c. theca and 

 paraphyses ; d. spore ; e. moniliform filament from the substance of the thallus. 



