OLIVE. — PRELIMINARY ENUMERATION OF THE SOROPHORE^. 335 



small projections above the surfece of the substratum, are not due to 

 any chemotactic stimulus such as must be assumed to cause the formation 

 of true pseudoplasmodia, but, although they may perhaps suggest the 

 possible beginnings of sucli conditions, are probably accidental, resulting 

 rather from a tendency of the amoebae to seek drier situations at the 

 period of fructification. 



SAPPINIA Dangeard (1896). 

 Characters of the order. 



Sappinia pedata Dangeard. 

 Le Botaniste, 5 Ser. p. 1-20. 5 Figs in text. 1896. 



Amojbfe forming resting conditions of three kinds : " amibes pedicel- 

 lees,'" in which they are transformed into a pear-shaped body without 

 definite wall raised above the substratum by a stalk of about equal 

 length ; " kystes pedicelles,'' in which they are similarly modified but 

 which form a definite wall about the oval body; and " spores," in which 

 groups of individuals become encysted at the ends of projections from 

 the substratum. 



On dung of horse, cow, dog. France ; Russia; Massachusetts ; Indiana. 



At least two species of this genus appear to be common on various 

 kinds of dung in this country, but owing to the fact that Dangeard gives 

 no measurements I have been uncertain which of them should be referred 

 to S. pedata. In both forms resting bodies comparable to the aggregated 

 '■'■ spores" occur, as well as '■^ amihes pedicelUes" although I have not as 

 yet observed the definitely walled ^^ kystes" which Dangeard appears to 

 distinguish from them. 



The larger and more frequent of the American species, which I have 

 assumed to belong to S. pedata, has the following measurements : stalk 

 of the " at7iibes pedicellees" 30 ij-125 /.t, head SOfi-GOjx long; rounded 

 individuals (" spores ") of the aggregations 20fi-50/j. in diameter. 



GUTTULINACE^ Zopf. 



Myxamoebae either limax-shaped, without pseudopodia, or of the 

 ordinary form with rounded or lobose short pseudopodia. The sori, 

 irregular in shape or spherical, sessile or stalked, consisting of either 

 spores or pseudospores. 



GUTTULINOPSIS nov. gen. 



Myxamoebae having lobose pseudopodia. Sori sessile or stalked, com- 

 posed of pseudospores, those of the stalk usually slightly elongated. 



