This species may be recognized by its tawny, irregular, more or less crowded sporangia. Under the lens the warted, not reticulate, spores are diagnostic. The elaters are quite constantly marked by imperfect spirals.
Our specimens are from the author of the species, and so far there are none reported from outside Ohio.
FOOTNOTES:
[15] For other crucifers, see Bull. Torr. Bot. Club, xxi, pp. 76–8.
[16] See in reference to this whole matter, Myxomycetenstudien by E. Jahn, No. 7, Ceratiomyxa, 1908. See also Olive, Trans. Wis. Acad. of Sci. Arts and Letters, Vol. xv, pl. II, p. 771.
[17] See Jahn, Myxomyceten Studien No. 8, Berlin 1911.
[18] In discussing these species the reader may be referred to Professor Harper's study of cytology, Bot. Gazette, vol. XXX., p. 217. It is probable that in all these æthalioid forms the effect of disturbance, transfer to laboratory, is likely to be quite pronounced. Giant spores are often seen, doubtless due to arrested cleavage in the procedure described by Dr. Harper: a giant spore is penultimate or antepenultimate in series; should, on this theory, occasionally, at least, show more than one nucleus.
[19] Prior to Persoon the physarums were variously referred: Lycoperdon, Sphaerocarpus, Trichia, etc. It seems unnecessary to quote the synonymy further here.
[20] Persoon's first-named species is P. aureum; see Römer Neu. Mag. f. d. Bot., I., p. 88. 1794.
[21] Fries (Sum. Veg. Scand., p. 454) described the new genus in the following words: Tilmadoche. Fr. Physari spec. S. M. Peridium simplex, tenerrimum (Angioridii) irregulariter rumpens. Capillitium intertexto-compactum, a peridio solutum liberum, sporisque inspersis fuscis. Columella o.