38 
OHIO BIOLOGICAL SURVEY 
2. T. stipitata (Berk, and Rav.) Macbride. Sporangia clustered in a 
flat hemispherical mass on a spongy stalk formed of the hypothallus. 
Spores pale rufous brown, minutely reticulated over the most of the 
surface, 3 to 5mmm. in diam. 
Erie Co., (Cuyahoga Co.—Lloyd Herbarium), (Licking Co.—Oberlin 
College Herbarium). 
3. T. casparyi (Rost.) Macbride. This species differs from T. 
ferruginosa in having a central columella which is connected to the 
sporangium wall by numerous straight tubular processes. Spores pale, 
rufous brown, closely reticulated, 6 to 7mmm. in diam. 
(Miami Valley—Morgan). 
FAMILY 8. RETICULARIACEAE. 
Sporangia combined into an aethalium. Sporangium walls incomplete 
perforated, or frayed into strands which may resemble a capillitium. 
True capillitium wanting. 
KEY TO THE GENERA OF RETICULARIACEAE. 
A. Sporangia columnar. 1. Dictydiaethalium 
A. Sporangia interwoven. 
B. Walls frayed into strands rising from the hypothallus. 2. Reticularia 
B. Walls perforated with large openings. 3. Enteridium 
1. DICTYDIAETHALIUM Rostaflnski. 
Dictydiaethalium plumbeum (Schum.) Rost. Plate VII, Figs. 5, 5a, 5b, 5c, 5d, and 5e. 
Sporangia columnar, combined into a very flat aethalium. Sporangium 
walls convex at the apex, the lateral walls absent except portions forming 
several straight threads that run from base to summit. Capillitium absent. 
1. D. plumbeum (Schum.) Rost. The flat aethalium, about 1mm. 
thick, is formed of regular erect sporangia, prismatic by mutual pressure. 
The sporangium wall is convex above and extends to the base in from 
four to six straight slender threads, the remainder of wall absent. 
Hypothallus silvery. Spores pale yellow, 9 to lOmmm. in diam. 
Cuyahoga Co., (Miami Valley—Morgan). 
2. RETICULARIA Bulliard. 
Reticularia lycoperdon Bull. Plate VII, Fig. 4. 
Interwoven sporangia forming an aethalium. Sporangium walls 
partly evanescent and partly persistent, forming broad strands which branch 
above into slender threads, constituting a pseudo-capillitium. 
1. R. lycoperdon Bull. Aethalium pulvinate, 1 to 8cm. broad, silvery 
white or dark colored, seated upon a well developed hypothallus. The 
