GLASGOW SOCIETY OF FIELD NATURALISTS. 219 



Tliallus ambitu nonnihil byssinus. In this respect it approacbes 

 L. subluteola (Nyl.) 



Lecidea proposita (Nyl.) 



Arthonia hormidiella (Stn.), sp. nov. 



Thallus pallidus tenuis bine inde rimulosus ; apothecia fusca vel 

 fusco-nigra, innato-sessilia convexula parva (latit. circ. -2 mm.) 

 segregata vel conjuncta vel moniliata et tunc linearia flexuosa vel 

 ramosula, ssepe margine tballino circurascisso cincta; sporse (4 —8) nse 

 incolores dein fuscse, oblongse vel fusiformi-oblongse nonnibil 

 ovoidesa S-septatse interdum l-septatse et e regione septorum ssepe 

 constrictulse, -02 — -029 x -008 — -01 mm., epitbecium fuscescens ; 

 hypotbecium incolor. lodo gel. bym. vinose rubens, gel. sub-bym. 

 coerulescens. Corticola. Gonidia oblonga mediocria cbroolepidea, 

 i.e., extus birsutula, virescentia. 



No otber gonidia tban tbose described bave been detected, and 

 tbey are often seen invading tbe bymenium. Tbe tballus is 

 nevertheless crustaceous, and none of tbe cbroolepoid threads can 

 be detected on tbe surface by means of a Codington lens. Tbe 

 spores recall tbose of some of tbe Stictse, 



Arthonia melanopsis (Stn.), sp. nov. 



Tballus fusco-niger rugulosus ; apothecia fusco-nigra vel nigra 

 (latit. -3 - -7 mm.) sessilia vel elevato-sessilia rugosa convexa et 

 immarginata, sparsa vel ssepius aggregata vel fere conglomerata, 

 intus obscura; sporae (4 — 8)n3e in thecis ellipticis, incolores 

 oblongo-ovatse, medio ssepius constrictulse, nebulose murali- 

 divisse vel (5—8 x 2— 3)-loculares, -024— -035 x -009— -013 mm.; 

 parapbyses nuUse. lodo protoplasma thecarum juvenilium 

 vinose rubescens, ea maturatarum vinose rubens, cseteroquin 

 bymenium non reagens. Corticola. 



A very curious lichen, if indeed it is such. The thecse are 

 imbedded in a dark coloured stroma, composed of largish cells 

 mixed with granules. There is, otherwise, no appearance of a 

 bymenium, properly so called. At times, indeed, a few large 

 green coloured gonidia are seen in connection with tbe apothecia, 

 and as there is no other lichen visible on tbe bark, the presump- 

 tion is they belong to this. This fact, along with tbe reactions 

 by Iodine on tbe thecse, which in a young state, especially, have 

 thick pellucid walls, is in favour of classification with tbe 

 Arthonise. 



