Lichens, Genera and Species 



The generic name Sticta from the Greek CTTJ/CTOS, dappled, 

 refers to the strikingly spotted appearance of some species. 



The spores are spindle or needle-shaped with 2 to 4 cross- 

 walls; they are reddish or colourless; they vary but slightly in 

 the different species. 



Sticta pulmonaria (L.), 

 Ach. See Colour Plate VII ; ' 

 also Plate VII. 



Habit and habitat. On g/ffiAsr^ 

 rocks and trees. &$*&* 



Vegetative organs (thal- 

 lus) . Leaf-like, leathery ; 

 tawny or olive, loosely 

 attached to the surface on 

 which it grows, lobes 

 large, entire, with 

 rounded sinuses; upper 

 surface netted and deeply 

 pitted; under surface pale 

 to white with rounded 

 prominences outlined with 

 slender hairs. Often bor- 

 dered with little white 

 grains (soredia). 



Fruiting organs (apothe- 

 cia). Not very common sessile on the margin of the lobes. 



Name. The specific name pulmonaria, lung, refers to the 

 resemblance the under surface has to the surface of a lung. 



Sticta amplissima, (Scop.) Mass. See Colour Plate VII. 



Habit and habitat. On fallen trunks and trees. 



Vegetative organs (thallus). Extending over quite large areas, 

 in an ever-widening circle appressed to the surface on which it 

 grows; leathery, smooth, becoming wrinkled with age; ashen- 

 green above; tawny, and covered with short, soft hairs (villous) 

 beneath; the lobes elongated, wide, usually compacted, or narrow 

 and repeatedly lobed. 



Fruiting organs (apothecia). Scattered, sometimes quite 

 large, the disk chestnut; the margin entire and inflexed. 



Name. The specific name amplissima, the Latin for "very 

 extensive," refers to its habit of growth. 



87 



Stictina fuliginosa. (o) Upper cortex; (u) lower 

 cortex; (r) rhizoids; (m) pith layer; (g) gonidial 

 layer. 



