PHY S ARUM 95 



SECTION 2 

 Tilmadoche Fries 



53. Physarum gyrcsum (Rost.) Jahn. 



1875. Physarum gyrosum Rost., Mon., p. 111. 



1902. Physarum gyrosum Rost., Jahn, Ber. Deutsch. Bot. Ges., XX., p. 272, 

 t. XIII. 



1911. Physarum gyrosum Rost., List., Mycetozoa, 2nd ed., p. 75. 



Sporangia gyrose, variable in form, or plasmodiocarpous and ir- 

 regular, venulose, sessile upon a common, strongly developed 

 hypothallus, sometimes isolated and irregularly globose, dehiscing ir- 

 regularly or by longitudinal fissure, yellowish or greyish white; col- 

 umella none; capillitium delicate, the nodules elongate, variable in 

 size; spores pale violaceous, minutely spinulose, 7-10 /x. 



This is a European species recently resuscitated by Dr. Jahn. It 

 perhaps might more correctly be recorded as P. gyrosum Jahn, since 

 Rostafinski certainly attempted in his description to cover two ap- 

 parently distinct things. He seems to have had before him Fuligo 

 muscorum Schw. and "P. gyrosum," but he thought them the same, 

 and his description touches now one, now the other. Since F. mus- 

 corum Schw. has all along held its own and received due recognition, 

 it is interesting to note the recovery of this gyrose form. 



Judging by description and figures, it resembles a very large, sessile 

 phase of P. polycephalum. See further under that species. 



Europe, Japan, Eastern United States (?). 



54. Physarum polycephalum Schw. 



Plate VIII., Figs. 2, 2 a, 2 h. 



1822. Physarum polycephalum Schw., Syn. Fung. Car., No. 382. 



1829. Didymium polycephalum (Schw.) Fries, Syst. Myc, III., p. 122. 



1837. Didymium polymorphum Mont., Ann. Sci. Nat., Ser. 2, 8, p. 361. 



1837. Didymium gyrocephalum Mont., op. cit., p. 362. 



1875. Physarum polymorphum (Mont.) Rost., Mon., p. 107. 



1875. Tilmadoche gyrocephala (Mont.) Rost., Mon., p. 131. 



1899. Tilmadoche polycephala (Schw.) Macbr., N. A. S., p. 57. 



1911. Physarum polycephalum Schw., List., Mycetozoa, 2nd ed., p. 58. 



