ARCYRIA.] 
ARCYRlACEiE, 
183 
KEY TO THE GENERA OF ARCYRIACE^. 
Sporangia stalked ; sporangium-wall evanescent above, persistent 
and membranous in the lower thii'd. (37) Arcyria. 
Fig. 45. — Arcyna pwiicea Pers. 
a. Groiip of sporangia. Twice natural size. 
h. Capillitium. Magnified 250 times. 
e. Spore. Magnified 560 times. 
Fig. 45. 
Sporangia sessile, clustered; sporangium- wall single, persistent, 
papillose, not thickened with angular granules. 
(38) Lachnobolus. 
Fig. 46. — Laclmohohis circinans Fries. 
a. Cluster of sporangia. Twice natural size. 
I. 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. — Periclimna po2mlina Fries. 
a. Group of sporangia. Magnified 7 times. 
J). Capillitiiun and spore. Magnified 280 times. 
Fig. 47. 
Genus 37.— ARCYEIA 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. 
