Arcykia.] BRITISH MYCETOZOA. 37 



ORDER II.— ARCYRIACEJE. 



Genus 30. ARCYRIA Hill.— Sporangia stalked ; sporangium- 

 wall persistent below as a membranous 

 cup ; stalks filled with spores or spore-like 

 cells; capillitium forming an elastic net- 

 work. 



1. A. ferruginea Sauter. — Sporangia 

 turbinate, crowded, orange-red, rarely 

 ochraceous ; the cup reticulated with 

 smooth, round-meshed thickenings. Capil- 

 litium-threads yellow-brown, free from the Fig. 38. 



cup, subtriangular in section, thickened Arcyria punicea Pers. 



with transverse bands and spines on one "■ G n a 7 u p ra f si s z p e ° rangia - Twice 

 side, with broken reticulation on the other, b. Capillitium. Magnified 250 

 Spores ochraceous, minutely warted, 9 to e _ g™".' Magnified s6o t i mes , 

 11 fi diam. 



Hab. On dead wood. Distinguished by its large spores. 



2. A. albida Pers. — Sporangia ovoid, pale grey. Capillitium 

 colourless or yellowish, attached to the cup; threads minutely and 

 closely warted, or spinulose, the central threads usually smooth. 

 Spores nearly smooth, 6 to 7 in diam. 



Var. pomiformis. — Sporangia globose, yellow. 

 Hab. On dead wood and sticks. Common. 



3. A. punicea Pers. — Sporangia ellipsoid or conico-cylindrical, 

 crimson, crowded. Capillitium attached to the cup, threads thick- 

 ened with half-rings, cogs or spines arranged in a loose spiral. 

 Spores nearly smooth, 7 ix diam. 



Hab. On rotten wood. Common. 



4. A. incarnata Pers. — Sporangia shortly cylindrical, flesh- 

 colour, crowded. Stalks short. Capillitium free from the cup; the 

 threads with few or many free clavate ends ; the thickenings as in 

 A. punicea, but usually more spinulose. Spores nearly smooth, 7 /j. 

 diam. 



Hab. On dead wood, sticks, etc. Common. 



g. A. flava Pers. — Sporangia cylindrical, ochraceous, crowded. 

 Capillitium free from the cup, expanding into a drooping column 

 many times the length of the sporangium ; threads beset with sharp 

 spines and half-rings, arranged in a loose spiral. Spores nearly 

 smooth, 7 ix diwi. 



Hab. On rotten wood. 



6. A. (Erstedtii Rost. — Differs from A. flava in being dull 

 crimson in colour, and in the slender threads being more evenly 

 spinulose. 



Hab. On fir wood. 



