Knight. — On some Few Zealand Lichens. 361 



13. Lecidea plesia, Knight. 



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

 ocria, elevato-marginata, margine flexnosa vel subanguloso-difformia. Sporm 

 lineari-clavatse, 4-5-septat8e, incolores vel diluto-fuscentes, longit. 0'032 mm., 

 crassit. 0*011 mm. Hypothecium nigrum. 



Ad saxa. 



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

 black, plane, medium size j 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. co7itigua in colour of thallus and the multilocular, 

 lineari-clavate spores; from L. sahuletorium, whose spores are elongate fusiform, 



14. Lecidea allotropa^ Nyl. 



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

 demum convexa, immarginata, nigra, sat parva. Sporce oblongse, 3-septat3e, 

 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, 0*006 mm. thick. Subhymeneal stratum of the hypothecium 

 colourless, the inferior white. 



14.* Pannaria periptera, sp. n. 



Thallus monophyllus, plumbeus, orbicularis, e laciniis linearibus ferme 

 adpressis flabelliformibus multifidis radiantibus compositus, centro 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) Goccocarpia periptera. One of the 

 most distinctive characters of the Coccocarpice is the adnate, immarginate 

 apothecia ; 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 

 C. smaragdina the thallus is furnished with gonimia in lien of gonidia ; but 



xl 



