GLASGOW SOCIETY OF FIELD NATURALISTS. 165 



etymology of the names of plants. By the introduction of similar 

 methods into scientific papers they might be made more pleasant 

 to the reader and far more profitable to his audience. 



Foreign Lichens. By De. James Stirton. 



Schistophoron tenue ; Gen. novum. 



Thallus pallide cinereus pulverulentus tenuis ; apothecia in 

 verrucis firmulis convexis rotundatis, oblongis interdum curvulis, 

 extus albido-farinaceis inclusa (longit. 'S — 1'6 mm., latit. circiter 

 •3 mm., altit. -3 mm), epithecio a massa sporali substituto, extus 

 lineari nigro (longit. -25 - 1-4 mm., latit. circiter -03 mm.) ; sporae 

 8nae primo incolores deia fuscse et nudse, 4'loculares (ioculis 

 mediis ssepius semel divisis), *012- -018 X "OOS - '01 mm.; para- 

 physes graciles parcpe. Gel. hym. (sin ulla) iodo haud tincta. 



Ad corticem Isevem prope Bonny Kiver in Africa occid., lectum 

 a Mr. Grant. 



This genus is allied to Tylophoron but is distinct in the elon- 

 gated thread-like apothecia, and in the constitution of th.e spores. 

 It bears nearly the same relation to Chiodecton as the sessile forms 

 of Tylophoron to Thelotreraa. 



The following lichens are due to the kindness of the late Rev. 

 G. Brodie, of the Port of Spain, Trinidad, who, amidst the multi- 

 farious duties of his profession often diverged from his route to 

 spots where such minute plants were likely to grow. Had he 

 been spared it is more than probable that I should have been 

 favoured with many such packages of the crustaceous lichens, for, 

 without any discriminative knowledge of the subject, he yet had a 

 natural aptitude and love for studies of a kindred nature. 



Lecidea gerontoides, sp. nov. 



Thallus cinereo-virescens vel cinerascens, minute rimuloso-areo- 

 latus vel nonnihil granulatus, tenuis nigro-limitatus (C flavens, vel 

 K — C flavens) ; apothecia sessilia ssepe aggregata, parva vel medi- 

 ocria (latit. '3 - "8 mm.), epithecio piano csesio-pruinoso (pruina C 

 flavente), margine nigro prominulo ssepe undulato; sporse Snse 

 fuscse oblongse 1-septatse, -014- -017 X -0045 - -006 mm.j para- 

 physes pellucidse graciles satis bene distinctse, apicibus fusco - 



