Knight. — On some New Zealand Liclv s. 361 



13. Lecidea plesia. Knight. 



Thallus ochroleucus, tenuis, areolo-rimosus. Apothecia nigra, plana, medi- 

 ocria, elevato-marginata, margine flexuosa vel subanguloso-difforinia. Sjwrai 

 lineari-clavatoe, 4-5-septata?, incolores vel diluto-fuscentes, longit. 0*032 mm., 

 crassit. 0-01 1 mm. Hypothecium nigrum. 



Ad saxa. 



Thallus pale ochrey colour, thin, divided into areolae by chinks. Apothecia 

 black, plane, medium size ; margin raised, flexuose or subangularly deformed. 

 Spores linear, clavate, 4-5-septate, colourless or pale brown, 0*032 millim. 

 long, 0*011 millim. thick. Hypothecium black. 



Differs from L. contiyua in colour of thallus and the multilocular, 

 lineari-clavate spores; from X. sabidetorium, whose spores are elongate fusiform. 



14. Lecidea ollotropa, Nyl. 



Thallus continuus, tenuissimus, cineraceus. Apothecia sessilia, planiuscula, 

 demum convexa, immarginata, nigra, sat parva. Sporce oblongee, 3-septatte, 

 longit. 0*015 mm., crassit. 0*006 mm. Stratum hypothecii subhymeniale 



incolore, stratum inferiore album. 



Thallus continuous, very thin, greyish. Apothecia sessile, flat, at length 

 convex, immarginate, black, rather small, spores oblong, 3-septate, 0*015 

 millim. long, 0006 mm. thick. Subhymeneal stratum of the hypothecium 

 colourless, the inferior white. 



14.* P armaria periptera, sp. n. 



Thallus monophyllus, plumbeus, orbicularis, e laciniis linearibus ferme 



adpressis flabelliformibus multifidis radiantibus compositus, centra concreto. 



Apothecia rubro-fuscentia, plana, margine duplici cincta, (excipulo a thallo 



crenulo marginato). Sporce incolores, ellipsoidese, simplices, longit. 0*013 



mm., crassit. 0*0075 mm. 



Ad cortices arborum. 



Thallus monophyllous, lead colour, round, formed of linear, firmly pressed, 

 fan-shaped, radiating lacinise, coalesced in centre. Apothecia reddish-brown, 

 flat, bound by double margin— the proper excipulum surrounded by a crenulate 

 thalline margin. Spores colourless, ellipsoid, simple, 0*013 millim. long, 



0*0075 mm. thick. 



On bark of trees. 



Named by Dr. Nylander (in a letter) Coccocarpia periptera. One of the 



most distinctive characters of the Coccocarpice is the adnate, immarginate 

 apothecia J it would, therefore, be unsatisfactory to place among the species of 

 that genus a lichen with two distinct raised margins to the apothecia — a 

 thallodal one enclosing a sharply defined excipulum. It is true that like 

 G. smaragdina the thallus is furnished with gonimia in lieu of gonidia ; but 



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