THE SLIME MOLDS OF OHIO 
31 
1. L. arcyrionema Rost. Sporangia gregarious, globose, 0.5mm. 
in diam., steel gray, blue, or bronze, iridescent, stalked, erect. 
Sporangium wall membranous, falling away in large fragments. Stalk 
long, slender, black, shining. Columella, slender, reaching to one-third or 
more the height of the sporangium where it divides into a few branches. 
Capillitium of purple brown threads arising from the apex of the 
columella, and frequently branching and anastomosing to form an 
intricate network with short free tips. Spores light violet, nearly smooth, 
6 to 7mmm. in diam. 
Southwestern Ohio. (Lorain Co.—Oberlin College Herbarium). 
2. L. scintillans (Berk. & Br.) Lister. Sporangia scattered or 
gregarious, globose, 0.3 to 0.5mm. in diam., steel blue or bronze, 
iridescent, stalked, erect. Sporangium wall membranous, falling away in 
large fragments. Stalk long, slender, black, shining, rising from a small 
circular hypothallus. Columella c^dindrical, black, not reaching the center 
of the sporangium. Capillitium dense of sparingly branched and 
♦ 
anastomosing rigid brown threads, pale at the base, and with rigid colored 
free tips. Spores violet, roughened with scattered warts, 7 to 8mmm. in 
diam. 
(Miami Valley—Morgan), (Ohio—Macbride), (Ohio—Lister). 
3. L. violaceum (Fries) Rost. Sporangia scattered or gregarious, 
subglobose, umbilicate below, 0.4 to 0.9mm. in diam., blue or purple, 
iridescent, stalked, sometimes sessile. Stalk short, stout, black, rising from 
a membranous brown hypothallus. Columella black, reaching to about 
the center of the sporangium. Capillitium. of pale or brown flexuous threads 
branching and anastomosing to form a network, the slender tips colorless. 
Spores purplish gray, minutely roughened, 8 to lOmmm. in diam. 
Rather common. 
4. L. sauteri Rost. This species is closely related to L. violaceum of 
which Lister considers it a variety, and it differs from that species in having 
a darker capillitium and larger and darker spores which are from 12 to 
15mmm. in diam. 
(Miami Valley—Morgan), (Ohio--Macbride). 
5. L. columbinum (Pers.) Rost. Sporangia gregarious, globose or 
ellipsoid, 0.5 to 0.8mm in diam., violet or purple with metallic iridescence, 
stalked, erect. Sporangium wall membranous, persistent. Stalk long, 
slender, black, shining, arising from a dark purple hypothallus. Capillitium 
of brownish purple threads arising from nearly all parts of the columella, 
branching and anastomosing and forming at the surface a delicate nearly 
colorless network. Spores purple, roughened, 11 to 14mmm. in diam. 
(Miami Valley—Morgan). 
