227 



Original description: "foliaceus, erectus, laciniatus albus, 

 scutellis potlcis, cucullatis, fuscis." I.e. Smith in epist. 



Figure: Smith, Act. Soc. Linn. 5: PI. 4./. 7. 1791. 

 Howe, Bot. Gazette 56: 498./. i. 1913, of type. 



4.. Lichenoides com^latum rigK 

 / Tke fttff Ch€jnut''€0mr'd hornet 



7^0 



^^^^j 



'.4^. 



Fig. 7. The Dillenian type of Cetraria Richardsonii preserved at Oxford, 

 England. An alga is mounted to the right on the same sheet. 



Diagnosis: Thallus fruticose, bifacial, canaliculate, elacunose, 

 yellow. 



Description: typical: Thallus fruticose (max. alt. 11 cm.), 

 rigid, stramineous to yellow, often pale virescent; cortex 

 glabrous, rarely sublacunose; branches bifacial connivo- 

 canaliculate (max. width 5 mm.), margins undulate or 

 lacerate, often spiculose. Apothecia not uncommon, 

 terminal, cucullate, ample (max. diam. i cm.), concave, 

 disk chestnut. Spores 7-10 X 3-4 m- 



Contingent phases: (a) Purplish at the base. 



