238 ENDOSPOREAE [ARCYRIA 



threads, about 3 fx diam., marked with transverse bands and 

 spines arranged in an open spiral, nearly smooth elsewhere. 

 Spores nearly colourless, 7 to 8 fj. diam., marked with a few 

 scattered warts.— Macbr. X. Am. Slime-Moulds, 197. Mucor 

 pomiformis Leers Fl. Herborn., 218 (1775)? Stemonitis pomi- 

 formis Roth Fl. Germ., 548 (1788) ? S. ochroleuca Trent rp. 

 in Roth Catal. Bot., i. 221 (1797). S. lutea Trentep. I.e. 

 Arcyria umbrina Schum. Enum. PI. Saell., ii., 213 (1803) ? 

 A. silacea Ditm. in Sturm Deutsch. Fl., Pilze, 15, t. 8 (1817). 

 A. lutea Schwein. Syn. Fung. Carol., 37 (1822). A. 

 ochroleuca Fr. Syst. Myc, iii. 181 (1829). A. albida var. 

 pomiformis Lister Mycetozoa, 186 (1894). 



PI. 176. — /. Z 1 . outer threads of capillitium net (England). 



Closely allied to A. cinerea, and connected with it l>y numerous 

 gatherings of intermediate character. The basal threads of the capilli- 

 tium are sometimes marked with three or four faint spiral bands. 



Hab. On dead wood.— TJplyme. Devon (B.M. 3050) ; Bath- 

 easton, Somerset (B.M. 278) ; New Forest, Hants (B.M. 3041) ; Whit- 

 church, Oxon (B.M. 3042) ; Hampstead Park, Birmingham (B.M. 

 1501) : Caddington, Beds (B.M. 3043) ; Witley, Surrey (B.M. 3044) ; 

 Epping Forest, Essex (B.M. 3045) ; Yorks. (B.M. 3046) ; Mid-Lothian 

 (B.M. 3051) ; North Germany (B.M. 2236) : Poland (Strassb. Herb.) ; 

 Switzerland (Zurich Herb.); Portugal (B.M. 3047); Japan (B.M. 

 3048); Xew Jersey (K. 877); Maine, U.S.A. (B.M. 1629); Phila- 

 delphia (B.M. 1927) ; Colorado (B.M. 3049). 



5. A. globosa Schwein. Syn. Fung. Carol., 38 (1822). 

 Plasmodium ? Sporangia scattered or gregarious, stalked, 

 globose, 0-3 to 0-6 mm. diam.. white, pale yellow or 

 brownish ; cup of sporangium shallow or rather deep, mem- 

 branous, smooth or papillose, often minutely and transversly 

 wrinkled. Stalk pale yellow or brown, slender, 0*2 to 0-5 mm. 

 high, filled with spore-like cells. Capillitium a close and only 

 slightly elastic network of colourless threads, 2 to 4 p. diam., 

 marked with warts or spines usually arranged along three or 

 four spiral lines that are seen to run from the left above to the 

 right below when the thread is viewed horizontally (in the 

 reverse direction to the spirals of Trichia elaters) ; sometimes 

 the threads are irregularly reticulated below the spines. 

 Spores colourless, 6 to 8 //. diam.. marked with a few scattered 

 warts. — Petch in Ann. Perad.. iv. 365. Craterium globosum 

 Fr. Syst. Myc, iii. 154 (1829). Lachnobolus globosus Rost. 

 Mon., p. 283 (1875) ; Mass. Mon., 137 ; Macbr. N. Am. Slime- 

 Moulds, 187. Arcyria albida var. globosa Lister Mycetozoa, 

 186 (1894). 



PI. 176. — g. sporangium on chestnut-bur (Alleghany Mountains); /(. capillitium: 

 i. sporangia on male flower of chestnut. 



This species was transferred by Rostafinski to the genus Lachnobolus. 



but its chief features — the stalked sporangia, the persistent cup of the 



sporangium-wall and the somewhat elastic capillitium, are characteristic 



