Physarum. 315 



Physarum hy2mophilum, Fries, Stirpes Femsj., p. 83 ; Sacc, 

 Syll., vii, 1, n. 1217. 



On Hypmtm cuprcssiformc, growing on damp rocks. Sweden. 



Scattered or gregarious, hypothallus not persistent; stem 

 either absent or very short, rather thick, subdecunibent, coloured 

 like the sporangium, which is very delicate, subglobose or 

 attenuated at the base, the size of a turnip-seed, bay, rather 

 shining, dehiscing by the irregularly torn apex ; rugulose when 

 old, but not hyaline, threads very slender, black, adnate to the 

 wall of the sporangium. (Fries.) 



There is a specimen of Lamprodcrma pliysaroides^ sessile or 

 nearly so, marked '^ Pliysarum hypoiophihim," by Fries, and 

 judging from the above description. Fries had probably had a 

 Lamproderma in view ; the bay colour is rather against this idea, 

 unless the coppery tint often present on the wall was intended. 



Physarum atrum, Fries. 



Closely aggregated, confluent, black; sporangia very thin, 

 rounded ; capillitium threads none ; spores black. 



Physarum atrum, Fr., Syst. Myc, iii., p. 147 (not of Schweinitz); 

 Sacc, Syll, vii., 1, n. 1221. 



Lycogala atra, Pers. 



On dead trunks. 



Sporangia adnate by a broad, flat base, rounded, connate 

 from the centre downwards, often densely crowded and forming 

 a continuous patch 2 mm. broad ; dehiscing irregularly, spores 

 very abundant. (Fries.) 



Rosfcafinski says (Mon., p. 302), that the present species is 

 •not a Myxogaster but an Aptiosporium, probably A. imersum, 

 but he had not examined an authentic specimen from Fries, 

 and as Fries' description of the present species does not agree 

 at all with the genus Apiosporium, it appears at best doubtful 

 as to whether this synonymy is correct. 



Physarum pulcherripes, Peck. 

 Peridiuin globose, variable in colour, ochraceous, grey, brown. 



