REV. W. A. LETGHTON OS NEW XEAV-ZEAL.VND LICHENS. 31 



1. B^OMYCES H^MOTROPUS, Lclglit., n. sp. Thallus crustaceus, 

 tenuis, pallide fulvo-ochrolcucus, glaber, verrucoso-nigosus, excavato- 

 reticulatus ; stipes brevissimus ; apothecium capituliforme, rotun- 

 datum. depressum, immargiuatura; canieo-subfuscura ; sporsc? splia;- 

 ricse, incolores, indistincte visai. 



Incrustans terrain atque graraina ealcata. Northern Island ( Colenso in 

 herb. Hooker,), 



The thallus of this interesting liclien is of a pale tawny-nau- 

 keen-colour, and closely inerusts the earth and gratis over which 

 it grows. The excavato-reticulate appearance is produced by the 

 cicatrices from which the stipites of fructification have fallen, 

 thus leaving minute, shalloAv, rounded depressions. The plant 

 was in a young state, as I could not clearly distinguish the la- 

 mina proligera ; nor am I certain that what I have described as 

 spores are really such. When the hydrate of potash is applied, 

 the entire lichen (thallus and fructification) becomes of a light 

 yellow hue, which immediately changes to a permanent deep san- 

 guineous red. In all otlier species of B^eomyces which I have 

 examined, the thallus exhibited a permanent yellow reaction,, and 

 the fructification an oi-ange-scarlet or brown reaction. 



Plate IV. fig. 1. Sceomyces iKsmotroj^ns^ nat. i?izc ; fig. 2. vertical section of 

 fructification, magnified. 



2. Lecidea decedenS; Nyl., n. sp. Thallus crustaceus, ochro* 

 leucus, tenuissimus, minute rimosus; areolai parva? depressa^ glabrae ; 

 apothecia multo majora areolis, prominentia, sessilia; discus planus, 

 pruinosus, margine nigro, elevato, tenui, acuto cinctus ; spora; 8, 

 elongato-oblongai, fuscse, biloculares; hypotheeium crassum, nigro- 

 brunneum, opacum; paraphyses validse, distincta;, apicibus incrassatis. 



Ad saxa, New Zealand ; httoral rocks, south side of Wellington Harbour 

 {ColensOy no. 6543, in herb. Hooker.), 



The nuclei of the spores approached more or less near to 

 each otlier, thus giving an appearance of a wider or narrower 

 septum. 



Plate IY, fig. 3, Lecidea decedem^ slightly enlarged ; fig. 4, vertical sec- 

 tion of apothecium, magn. j fig. 5, ascus and paraphyses, magn. ; fig. 6, 

 spores, magn. 600. 



3. Lecidea ^ruginosa, Nyl. Chil. Thallus crustaceus, tenuis, 

 ochroleuco-flavidus, rimulosus ; areolae depresso-couvexiusculae; gla- 

 brae ; apothecia multo majora areolis, prominentia, sessiha, discus 

 uigro-brunneus, convexiusculus, margine corneO; crassiusculo, pallido, 

 integro, sa?pe uudulato ductus; hypotheeium pallidum; sporcc 8, ob- 



longae, slmplices, incolores. 

 Ad saxa. New Zealand; same station as the preceding {Colenso in herb. 



Hooker. 6541-6544). 



