Dr. Nylander on the Cephalodia of Lichens, 351 



colour, A. suturalis has the antennaj much stouter and the 

 elytra much more deeply striate than^. elUpsoides. 



Amarygmiis torridus. 



A. breviter ovalis, convexus, nitidus ; prothorace fulvcsccnti-cupreo ; 

 elytris viridi-metallicis, fortitcr seriatim punctatis ; corpus subtus 

 femoribusque castaneo-fuscis. 



Hab. Cape York. 



Shortly oval, convex, shining ; head black ; clypeus very 

 broad ; antennee reddish brown, slightly thicker outwards, ex- 

 tending to half the length of the body, third joint longest, the 

 rest of nearly equal length ; prothorax yellowish copper, 

 closely and finely punctured ; scutellum equilaterally tri- 

 angular, black ; elytra about a quarter longer than broad, 

 convex, coarsely seriate-punctate, all the punctures about 

 equidistant from one another ; body beneath and femora dark 

 chestnut-brown, slightly nitid ; tibia3 and tarsi reddish brown. 

 Length 5^ lines. 



In form something like A. convexus j but shorter. An iso- 

 lated species. 



XLIII. — Notidce Lichenologicce. No. XXVIII. 

 By the Kev. W. A. Leighton, B.A., F.L.S. 



In the ' Flora ' of Sept. 30, 1868, Dr. W. Nylander has some 

 observations on Cephalodia which are worthy of attention. 



These organs of Lichens were little known before Dr. Ny- 

 lander pointed out their importance as furnishing a primary 

 anatomical character in their gonimia. They occur only in 

 tlialli which have gonidia. 



The kinds hitherto observed are : — 



1. Ejyigenous cephalodia, on the upper surface of the thallus, 

 variously protruded and of various forms, according to the 

 genera and species in which they occur. They are the most 

 frequent. 



2. Hypogenous cephalodia, less frequent, on the under sur- 

 face of the thallus, known only in Peltidea venosa and Psoroma 

 euphylJum. 



3. Endogenous or Pyrenoid cephalodia, which are immersed 

 in the thallus and form a pyrenocarpoid protuberance (covered 

 by the thallus) on the lower surface of the thallus. These are 

 found in foliaccous Lichens, as in many Stictet, Nephroma ew- 

 palliduniy &c. 



