SYNOPSIS OF MYCETOZOA 191 



>ictydium Schrader. Sporangia globose, purple-brown ; 

 sporangium- wall with parallel ribs extending from the base 

 to the apex, connected by slender transverse threads 



umbilicatum Schrad. 



Order II. — Liceace^:. 



27. Licea Schrader. Sporangia sessile and hemispherical, or 



forming plasmodiocarps ; sporangium-wall cartilaginous 

 (membranous in L. biforis) ; spores olive-brown or nearly 

 colourless. 



A. Sporangium-wall cartilaginous : — 



Sporangia hemispherical, dehiscing in lobes ; spores 9-11 yx 



L. minima Fr. 



Sporangia pulvinate, dehiscing in lobes ; spores 16-20 p 



L. pusilla Schrad. 



Plasmodiocarps elongate, 2-4 mm. long, dehiscing irregularly 



L. flexuosa Pers. 



B. Sporangium-wall membranous ; plasmodiocarps about 0-2 mm. 



long, 0*05 mm. wide, dehiscing by a longitudinal fissure 



L. biforis Morg. (22, p. 6*). 



28. Orcadella Wingate. Sporangia stipitate ; sporangium-wall 



opaque, cartilaginous, granular except in the upper part, 

 where it forms a membranous lid • O. operculata Wing. 



Order III. — Tubulin ace^e. 



29. Tubulina Persoon. Sporangia cylindrical, crowded on a com- 



mon hypothallus ; capillitium none. 



Sporangia clustered on a broad hypothallus, spores 5-8 /* 



T. fragiformis Pers. 



Sporangia clustered on a stalk-like hypothallus, spores 3-5 /x 



T. stipitata Host. 



30. Siphoptychium Rostafinski. Sporangia cylindrical, with 



tubular threads connecting the wall with a hollow central 

 pseudo-columella S. Casparyi Host. 



31. Alwisia Berkeley & Broome. Sporangia stalked, ellipsoid ; 



sporangium- wall evanescent in the upper half; the lower 

 half at length splitting into lobes bearing the persistent 

 straight threads of the capillitium 



A. Bombarda Berk. & Br. 



Order IV. — Reticulariaceje. 



82. Dietydiaethalium Rostafinski. JEthalium flat, formed of erect 



columnar sporangia; sporangium-wall incomplete, dome- 

 shaped on the top, continued to the base in four to six 

 straight threads D. plumbeum Rost. 



33. Enteridium Ehrenberg. iEthalium composed of confluent 



interwoven sporangia, their wails perforated with large 



openings 



