138 



GUIDE TO THE BRITISH MYCETOZOA. 



Stenionitacccp, with typically separate sporangia, lias a singular 

 exception in the curious conflnoit condition of S. fusca (Moa. 110). 

 In the genus Chondrioderm a the position of C. Michelii arrests one's 

 attention. The examination of some thousands of C. testaceum in 

 the field suggests that C. reticulatum and C. niveum are the natural 

 offsets of the former. At least these three have an interesting 

 hahit of commensalism suggesting community of descent, whilst 

 C. Michelii is conspicuous by its absence. One learns, however, 



Diaiiema depressnm 

 Lister. 



a. Plasmodiocarp. x 2. 



b. Capillitium attached 



above and below to 

 the walls of the spo- 

 rangium. X 50. 



c. Spore. X 560. 



Badhamia utricular is 



Berk. 

 . Cluster of sporangia. 



X 3i. 

 . Fragment of capil- 

 litium and spore- 

 cluster. X 140. 



Cienkoivskia reticulata 

 Boat. 



a. Part of branching 



plasmodiocarp. x 4. 



b. Capillitium threads 



and part of a per- 

 forated lime-plate. 

 X 140. 



Lycogala miniatum 

 Pars. 



a. Three sethalia. Nat. 



size. 



b. Capillitium. x 150. 



c. Spore. X 600. 



Physarum nutans 

 Pers. 



a. Two sporangia, x 9. 



b. Capillitium threads, 



with lime-knots, at- 

 tached to a fragment 

 of the sporangium- 

 wall. X 110. 



Cribraria auruntiaca 



Schrad. 

 . Group of sporangia. 



X 2. 

 , Sporangium after dis- 

 persion of the spores. 

 X 20. 



from Mr. Lister that American observers have "sent fine specimens 

 of flat winding plasmodiocarps corresponding with Rostafinski's 

 type of G. reticulatum , which Mr. Wingate (of Philadelphia) has 

 found in company with the stalked C. Michelii." Here we might 

 suggest that C. testacemn may be taken as a convenient centre from 

 which the other forms diverge. 



It is certainly agreeable to some of the workers in this field 

 that many of the varieties named and described in the monograph 

 have been omitted from the Guide. This course simplifies the 

 subject considerably, without diminishing the practical value of the 

 classification. Probably the most interesting portion to the ordinary 



