178 THE MYXOMYCETES OF P1CTOU COUNTY. MOORE. 



B. Saprophytic, developed in connection with decaying 

 vegetable material. 



(a) With free spores. 



Sub-class. Exosporeae. 



(6) With spores in receptacles or sporangia. 



Sub-class. Myxogastres. 



The correctness, (however, of including in the group such 

 forms as Plasmodiophora may well be questioned. It still 

 remains unsettled as to whether these form true plasmodia, the 

 production of which must be taken as the great outstanding 

 feature in the life history of the remaining members of tlhe 

 class. This doubt might well be considered sufficient ground 

 for their exclusion. 



In the account of Nova Scotia forms which follows, I have, 

 however, adopted the classification and nomenclature of Mac- 

 bride in toto. The description of species have been compiled 

 from collections of my own made during the summers 1905 and 

 1906 in the vicinity of Pictou town and in various other parts 

 of Pictou county. The list of forms is undoubtedly far from 

 exhaustive, but I think will be found to include most of our 

 common Nova Scotia species and some which Avill probably be 

 found to be of rather rare occurrence. 



One form I have described as a new species. I may say that 

 a portion of the gathering from which the description is com- 

 piled was submitted to Dr. Macbride, who reported it tentatively 

 as Margarita metallica Lister, a species hitiherto unknown from 

 this continent. A careful comparison with the description of 

 Margarita metallica as given by Lister has led me to the conclu- 

 sion that we have here a distinct species of the genus Margarita. 



In determining spore characteristics a Leitz 1/12 oil immer- 

 sion objective was used in combination with a No. 5 eyepiece 

 affording a magnification of 1200 diameters. Except where 

 otherwise indicated, the drawings are camera lucida sketches 

 made during my studies of the various species. 



