Plijl^iwum. 287 



Physarum simile, Rost., Mon. Append, p. 6 (species founded 

 by Rostafinski on a specimen in Heib. Berk.); Sacc, Syll., vii., 

 1, n, 1175. 



Physarum Petcrsii, var. Farlowii, Rost., Mon. Append., p. 6 

 (specimen named by Rostafinski in Herb. Berk.). 



Krsicc. — Ellis, N. Amer. Fung., n. 1120. 



On wood, moss, &c. United States. 



Closely resembling P. Petcrsii, differing in the grey sporangium. 

 About 1.5 mm. high. 



Physarum leucopus, Rost. (figs. 60 — 02). 



Sporangia globose, broadly ellipsoid or a little depressed, 

 stipitate or sessile, rarely elongated and flexuous or anasto- 

 mosing, wall at first covered tvith a continuous, snow-white coat of 

 lime, which soon becomes hrohen up into smooth, innate 2Mtches ; 

 stem variable in length, white, containing lime, straight, brittle, 

 slightly thinner upwards, longitudinally rugose, passing into a 

 more or less evident hypothallus ; columella absent ; capillitium 

 strongly devclojjcd, snow-white, loith numeroiLS large, irregularly 

 branched knots, containing lime in small granules; spores 

 globose, dingy lilac, rather coarsely ivarted, warts almost black, 

 9 — 12 \j. diameter. 



/. stipitatum. Stem present, length variable, in the typical 

 form, equal to, or longer than, the sporangium. 



/. sessile. Stem very short or entirely absent, when the 

 sporangia are sessile on a broad base, sometimes confluent, 

 elongated, sinuous, or anastomosing irregularly. 



Physarum leucopus, Rost., Mon., p. 101 ; Cke., Myx, Brit., 12; 

 Schroeter, p. 129; Karsten, Myc. Fen., p. 102; Sacc, Syll., 

 vol. vii., pt. I., n. 1188. 



Physarum Imcophacum., y. flc.cuosum, Cooke, Myx. Brit., p. 15. 



Exsicc. — Rab., Fung. Eur., 835 (as Pltysarum alhipcs); Cooke, 

 Fung. Brit., Ed. II., 519. 



On wood, moss, &c. Britain (Highgate, Carlisle); Germany; 

 Finland ; Sweden ; S. Africa ; S. America ; Ceylon ; Australia. 



A somewhat rare species, often represented in Herbaria by 



