OLIVE: MONOGRAPH OF THE ACRASIEAE. 
497 
ACRASIEAE van Tieghem, 1880. 
Saprophytic, usually coprophilous organisms, having two definitely 
recurring stages, — a vegetative period, in which independent 
myxamoebae crawl about by meaus of amoeboid movements and 
undergo multiplication by division; and a fructifying period, in 
which the myxamoebae typically aggregate into colonies called 
pseudoplasmodia and form either spores or pseudospores, held 
together by a mucous substance, and borne in stalked or sessile 
naked masses, or sori. 
Sappixiaceae. 
Myxamoebae comparatively large, with lobose pseudopodia. The 
resting stage consists either of a single encysted individual or of 
many individuals encysted in masses at the ends of projections of 
the substratum. 
This group is included here only provisionally, since the amoebae 
normally become encysted singly, thus forming microcysts, and do 
not show the characteristic phenomenon of aggregation, or colony 
formation. The aggregations which, it is true, often occur at the 
distal ends of small projections above the surface of the substratum, 
do not appear to be 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 such 
conditions, they are probably accidental, resulting rather from a 
tendency of the amoebae to seek drier situations at the period of 
fructification. 
Sappinia Dangeard, 1896. 
Plate 5, fig. 1-7. 
Characters are those of the order. 
Sappinia pedata Dangeard. 
Le Botaniste, t. 5, p. 1-20, 5 figs, in text, 1896. 
Amoebae forming resting conditions of three kinds: amibes 
p4dicell4es,’’ in which they are transformed into a pear shaped body 
