1 6 BRITISH MYCETOZOA. 



Order III. — Tubulinace^e. Sporangium-wall membranous, 

 without microscopic round granules. 



Genus 23. Sporangia tubular, compacted. Tubidina (p. 32). 



Order IV. — Reticulariace^e. Sporangia combined into an 

 aethalium, their walls incomplete, perforated, or forming a spurious 

 capillitium. 



Genus 24. Sporangia columnar. Dictydicethalium (p. 33). 



Genus 25. Sporangium-wall reduced to broad bands. 



Enteridium (p. t,^). 

 Genus 26. Sporangium-walls laciniated. Rcticularia (p. ^^). 



Sub-cohort U.—CALONEM1NEA?. Capillitium present; a 

 system of uniform threads. 



Order I. — Trichiace/E. Capillitium of free elaters, or an elastic 

 network with spiral thickenings. 



Genus 27. Elaters free, spirals distinct. Trichia (p. 34). 



Genus 28. Elaters scanty, spirals nearly wanting. 



Oligonema (p. 35). 

 Genus 29. Elaters combined into a web or network. 



Hemitrichia (p. 36). 



Order II. — Arcyriace^e. Capillitium a profuse network of 

 threads (sometimes scanty in Peric/ia'na), thickened with cogs, halt 

 rings, spines or warts. 



Genus 30. Sporangia stalked, sporangium-walls evanescent 

 above. Arcyria (p. 37). 



Genus 31. Sporangia sessile, the walls single, persistent. 



Lacluwbolns (p. 38). 

 Genus 32. Sporangia sessile, the walls double. 



Perichcena (p. 38). 



Order III. — Margaritace^e. Capillitium coiled, hairlike and 

 solid, or straight and attached to the sporangium-wall. 



Genus ^. Capillitium profuse, coiled. Margarita (p. 39). 



Genus 34. Capillitium straight. Dianema (p. 39). 



Genus 35. Capillitium penicillate, spirally banded. 



Prototrichia (p. 40). 



Order IV. — Lycogalace^e. Sporangia forming an aethalium ; 



capillitium consisting of branched colourless tubes. 



Genus 36. Lycogala (p. 40). 



