. The North American slime-moulds [microform] : being a list of all species of Myxomycetes hitherto described from North America. Myxomycetes; Myxomycètes. :. PERICILENA would seem then nothing to do but to apply to the form bofoic us a new specific name. Not common. , Ohio. Illinois, Missouri. 3. corticalis (Batsch) Rost. II., Fi^rs. ,, , ,,^ , f,^ 1783- Lycopcnion coriicalc , FJcnch. Fmii^.. p. 155 1817- Po-nlunuipopnliiui Fries, Symh. Cast., p'. i^ 1875. Pcric/uena corticalis (Batsch) Rost., Mon., p. 293. _ Sporangia sessile, gregarious, flattened, h
. The North American slime-moulds [microform] : being a list of all species of Myxomycetes hitherto described from North America. Myxomycetes; Myxomycètes. :. PERICILENA would seem then nothing to do but to apply to the form bofoic us a new specific name. Not common. , Ohio. Illinois, Missouri. 3. corticalis (Batsch) Rost. II., Fi^rs. ,, , ,,^ , f,^ 1783- Lycopcnion coriicalc , FJcnch. Fmii^.. p. 155 1817- Po-nlunuipopnliiui Fries, Symh. Cast., p'. i^ 1875. Pcric/uena corticalis (Batsch) Rost., Mon., p. 293. _ Sporangia sessile, gregarious, flattened, hemispherical • pe- ridia simple, opening by a lid; dehiscence circumscissile the upper part chestnut brown, the lower almost black; capillitium feebly developed, smooth, attached to the lid and usually coming away with it, bringing the brilliantly yellow spore- mass, and leaving a delicate, shining cupule adherent to the substratum; spores yellow, nearly smooth, 10-12/* On and under the bark of dead elms of various species. A very handsome little species occurring rarely with us or perhaps overlooked by virtue of its protective coloration Found sometimes on the inner side of the bark where the latter has separated, but not yet wholly parted companv with the wood. In such situations the tiny sporangia are so nearly quite the color of the substratum as to escape all but the closest scrutiny. The dehiscence is very remarkable, character- istic, beautiful. Black, brown, chestnut, and gold are harmo- niously blended, in the opening coffers. Prior to maturity the future line of fission is plainly indicated by the difference in color. This is clearly the .species found by Batsch " ligni demortui putridi in interiore corticis ; Bulliard has also well described and figured the species, Sphcerocarpns scssilis t 417 Fig. V. The capillitium is nearly smooth; the spores are only slightly roughened by minute warts. Apparently not common. Iowa, Missouri; Black Hills
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