Physarum.] BRITISH MYCETOZOA. 19 



2. P. murinum Lister. — Sporangia subglobose, stalked or sessile, 

 brown, 0-5 mm. diam. Stalk charged with lime throughout. Capil- 

 litium with brown lime-knots. Spores violet-brown, nearly smooth, 

 8 to 10 jx diam. 



Hab. On dead wood, leaves, etc. Rare. 



3. P. citrinum Schum. — Sporangia subglobose, gregarious, 0-4 

 to 07 mm. diam., yellow ; stalk stout, yellow, charged with lime 

 throughout. Capillitium rigid; lime knots yellow. Spores violet- 

 brown, almost smooth, 7 to 8 ti diam. 



Hab. On dead wood, moss, etc. 



4. P. psittacinum Ditm. — Sporangia subglobose, gregarious, 

 0-5 mm. diam., purple or metallic green mottled with red. Stalk 

 orange-red, translucent. Capillitium with bright orange lime-knots. 

 Spores dull violet, nearly smooth, 7 to 8 /x diam. 



Hab. On old stumps. 



5. P. viride Pers. — Sporangia subglobose, nodding, scattered, 

 o'5 mm. diam., yellow, greenish, or orange. Stalk subulate, trans- 

 lucent, containing refuse matter. Capillitium slender; lime-knots 

 fusiform, orange. Spores violet-brown, nearly smooth, 7 to 10 yu 

 diam. 



Hab. On rotten stumps, etc. Common. 



6. P. nutans Pers. — Sporangia subglobose, erect or nodding, 

 gregarious, 0-4 to 1 mm. diam., pale grey. Stalk subulate, straw- 

 coloured or dark, containing refuse matter. Capillitium slender ; lime- 

 knots small, white ; spores violet-brown, nearly smooth, 8 to n /x 

 diam. 



Var. leucophaeum. Sporangia erect, stalked, or plasmodiocarps 

 stalks stouter. Capillitium more rigid ; lime-knots larger. 

 Hab. On dead wood. Common. 



7. P. calidris Lister. — Sporangia globose, scattered, 0^5 mm. 

 diam., white. Stalk red, translucent. Capillitium-threads slender ; 

 lime-knots white ; irregular in shape and size. Spores pale brownish- 

 violet, nearly smooth, 8 to 1 1 /*. diam. 



Hab. On dead leaves, etc. 



8. P. compressum Alb. and Schw. — Sporangia subglobose or 

 lobed, compressed ; stalked, sessile or plasmodiocarps, grey. Stalk 

 dark or white, containing refuse matter. Capillitium-threads terete, 

 flexuose ; lime-knots white, numerous. Spores dark purplish-brown, 

 spinulose, 9 to 14 /x diam. 



Hab. Dead wood, bark, and leaves. A very variable species. 



9. F. didermoides Rost. — Sporangia ovoid, erect, crowded, 

 05 mm. broad, white, diffused grey above. Stalk short, white, 

 membranous. Capillitium flexuose; lime-knots numerous, rounded. 

 Spores very dark purple-brown, nearly smooth, 10 to 13/4 diam. 



Hab. On dead wood, leaves, etc. 



