PELTIGERA. 



165 



emetic properties, probably on insufficient or imaginary 

 grounds. 



3. Peltigera canina [cards, a dog). Thallus prostrate, 

 membranaceous, brownish-green or greyish, subtomentose, 

 below spongiose, whitish, reticulated with pale brownish 

 veins, which generally give off vertical fibrils; apothecia 

 chestnut-coloured, at first involute in the margins of the 

 thalline lobes, affixed vertically to the produced and as- 

 cending lobules, orbicular, becoming elongated, with revo- 

 lute margin. (E. B. 2299 var. ulorrhiza.) 



A small digitate-lobate variety is called var. spuria ; along 

 with the commoner form it is sometimes sorediiferous. 



A very common Lichen, growing in somewhat moist 

 places among moss, on stones, the ground, or mossy tree- 

 trunks or roots in lowland, as well as subalpine and alpine, 

 woods and heaths. The change in colour produced by 

 drying is very marked : in the moist state, growing among 

 moss, it has frequently a deep apple-green colour, but her- 

 barium specimens have usually an ashy-grey or brownish 

 tint. Hence its familiar name is "Ash-coloured Ground 

 Liverwort// under which designation it is to be found in 

 the shops of some of the London herbalists. This is ■ a 

 good species in which to study the cells of the vegetative 



