ARCYRIA.] ARCYRIACE.E. 



KEY TO THE GENERA OF ARCYRIACEJE. 



183 



Sporangia stalked ; sporangium- wall evanescent above, persistent 

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



Fig. 45. Arcyria punicea Pers. 



a. Group of sporangia. Twice natural size. 

 Z>. Capillitium. Magnified 250 times. 

 c. Spore. Magnified 560 times. 



Fig. 45. 



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

 papillose, not thickened with angular granules. 



(38) LACHNOBOLUS. 



Fig. 46. Laclinobolus circinans Fries. 



a. Cluster of sporangia. Twice natural size. 



b. 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. Periclicena populina Fries. 

 rt. Group of sporangia. Magnified 7 times. 

 b. 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 

 spirals in addition. 



