ARCTRIA.J ARCYRIACEJE. 



KEY TO THE GENERA OF ARGYRIACEM 



183 



Sporangia stalked ; sporangium- wall evanescent above, persistent 

 and membranous in the lower third. (37) Aecteia. 



Fig. 45. — Areyria punicea Pers. 

 a. Group of sporangia. Twice natural size. 

 J. CaplUitium. Magnified 250 times. 

 ii. Spore. Magnified 560 times. 



Fig. 45. 



Sporangia sessile^ clustered; sporangium- wall single, persistent, 

 papillose, not thickened with angular granules. 



(38) Lachnobolus. 



Fig. 46. — Laclmoholus circinans Pries. 

 a. Cluster of sporangia. Twice natural size. 

 h. Capillitium and spore. Magnified 300 times. 



Fig. 46. 



Sporangia sessile or plasmodiocarps ; sporangium- wall double, at 

 least at the base ; the outer layer thickened with dark 

 angular granules. (39) Perich^na. 



Fig. 47. — PericTieena popvilina Fries. 

 a. Group of sporangia. Magnified 7 times. 

 J. Capillitium and spore. Magnified 280 times. 



Fig. 47. 



Genus 37.— ARCYRIA Hill, Nat. Hist., ii., p. 47 (1751). 

 Sporangia stalked; sporangium- wall evanescent above, persistent 

 as a membranous cup in the lower third ; stalk filled with spores 

 or spore-like cells ; capillitium with thickenings in the form of 

 half-rings, cogs, spines, or broken reticulation, rarely with faint 

 sprals in addition. 



