PL cell, aph, 9, GASTEROMYCEiE. 212.Didym. 571 
2. Didymium testaceum . Pearly skin-mould , 
Sporangia sessile, roundish, hemispherical, flesh-colour, 
afterwards whitish. 
Didymium testaceum, Schrad. N. Gen. PI. 1, 25. 
Diderma testaceum, Persoon Syn. 167. 
On decayed leaves; autumn. 
3. Didymium difforme. Irregular skin-?nou 2 * * * * 7 d. 
Sporangia sessile, smooth, difForm ; outer peridium. snow- 
white; inner bluish; sporidia dull-brown. 
Reticularia angulata, Gmelin Syst. Nat. 2, 1472. 
Diderma difforme, Persoon Syn. 167. 
On the stems of the potatoe-plant. 
XII. 213. DIDERMA. Link. Tall-mould . 
Sporangium roundish or globular ; peridia double, both 
membranaceous, bursting ; outer chaffy ; columella 0 ; spo- 
ridia crowded. 
Diderma muricolum . Wall tall-mould . 
Sporangium roundish, lobed, rather angular, sessile ; 
outer peridium white ; inner brown ; sporidia black-brown. 
Diderma Muricola, Link in Bert. Mag. 3. 
Diderma difforme, Alb. et Schwein. Fung. 90. 
On mosses. 
XIII. 214. CIONIUM. Link. Flock-mould . 
Sporangium globular, pedicelled ; peridium single, mem- 
branaceous, bursting, separating into scales ; columella 
distinct. 
1. Cionium iridis. Flag flock-mould . 
Sporangium globular, pedicelled ; peridium grey ; pedicell 
yellow, thickest at bottom. 
Cionium iridis, Ditmar in Sturm. Deutsch. FI. 3, 1. 
On the leaves of the yellow water-flag ; summer. 
2. Cionium far inaceum. Floury flock-mould. 
Sporangium globular, pedicelled ; peridium grey ; pedicell 
grey, thickest at bottom. 
Didymium farinaceum, Schrad. N. Gen. 26. 
Trichia compressa, Trentepohlin Both Cat. Bot. 1, 229. 
Physarum melanospermum, Persoon Disp. 3 . 
Physarum farinaceum, Persoon Syn. 175, 15. 
On the branches of pine-trees, or the mosses on them. 
Sporangia sometimes unite in pairs. 
