MYXOMYCETES. 15 



8. Physarum leucophaeum. />. 



Sporangium irregularly globose, usually stipitate, with a stem 

 of variable length, now and then short and obsolete, then appa- 

 rently sessile, sometimes confluent and formed into an entangled 

 plasmodiocarp ; capillitium characteristic, thin-sided between the 

 knots, either long or very short, only rarely containing granules of 

 lime, all very irregular; spores bright violet, smooth, '0087-'0096 

 mm. cliam. Rtfki.Mon., 113. 



On trunks, amongst moss, &c. 



a geiruixvum. Sporangium greyish- white; stem stiff, erect, bright 

 brown, now and then sessile. 



(1) stipitatum. Sporangium stipitate. 



b. connexum. Stems grown together through their 

 whole length ; sporangia now and then confluent. 



(2) sessile. Stem, short, disappearing, or entirely unde- 

 veloped, standing singly. 



b. conglobatum. Sporangia standing in little heaps, 



now and then confluent. 



(3 violascens. Sporangia violet, iridescent ; stem often straw- 

 coloured, now and then but little stiff, almost recumbent on 

 the substratum. Here belongs the form with but little lime. 



(1) stipitatum. 



(2) sessile. 



y flexuosum. Plasmodiocarp vein-like, creeping, now and then 

 combined in a reticulate manner. 



On leaves, &c. 



Splicerocarpus albus, Bull., p. 136, var. 3, 4 (1791). 

 Trichiafilamentosa, Trent., p. 227 (1797). 

 Physurum conftuens, Link. Diss. ii., 42 (1809). 

 Physarum connexum, Link. Diss. ii., 42 (1809). 

 Physarum hypnorum, Link. Diss. ii., 42 (1809). 

 Physarum albopunctatum, Link. Herb. 

 Physaruni chii'us, Ehr. Herb. 

 Physarum conglobatum^ Ditm., t. 40 (1817). 

 Physarum leucophaum, Fr. Sym. Gast., p. 24. Sys. Myc. iii., 

 132 (1818). Cooke Fungi Brit" ii., No. 519. 



Didymiitm melanopus, (3 davits, \Vallr. non Fries (1833). 

 Didymium terrestre, Fr. in Weinm (183G). 

 Physarum albipcs, De Bary, not Link. (1^59). 

 Physarum striatum, Fckl. Sym. Myc., 342 (1869). 

 Didymium liemisphericum, Fckl. Sym. Myc., 341 (1869). 



Although differing in some particulars from the forms described 

 by Rostafinski, we have nevertheless referred the species issued in 

 " Fungi Britannici " to this place. The specimens contain, mixed 



