A well-marked species easily recognized by the characters cited. The extent of lime deposit at the capillitial nodes varies; sometimes very little. This accounts for Berkeley's generic reference. On the other hand, Lister makes the rounded lime knots "each knot with a red centre surrounded by yellow, round, lime-granules" diagnostic. This pied condition does not come out in any of our specimens. The capillitium in broken specimens soon fades, tends to white, etc. New York, Pennsylvania, Ohio, Colorado, and south. Ceylon, Java, Brazil. 3. PHYSARUM VERNUM _Somm._ 1829. _Physarum vernum_ Somm., Fries, _Syst. Mycol._, III., p. 146. 1875. _Physarum cinereum_ (Batsch), Rost., _Mon._, p. 102, in part. 1875. _Badhamia verna_ Rost., _Mon._, p. 145. 1894. _Badhamia panicea_ Rost., List., _Mycetozoa_, p. 34. 1899. _Physarum cinereum_ (Batsch) Rost., Macbr., _N. A. S._, p. 34 (in part). 1911. _Physarum vernum_ Somm., Lister, _Mycetozoa, 2nd ed._, p. 75. "Plasmodium white." Sporangia sessile, generally plasmodiocarpous white, nearly smooth; peridium more or less testaceous not scaly, but breaking irregularly; capillitium densely calcareous, the nodules angular, branching, sometimes united to form a pseudo-columella; spores dusky violaceous, rough, 10-12 mu. Sommerfeldt's description quoted by Fries, _l. c._, evidently concerned a less calcareous phase. Fries by his annotation relieves somewhat the reader's uncertainty. Rostafinski calls this a badhamia but describes a physarum, and the form has, as is believed, been consistently confused with _P. cinereum_ by every student of the group from the days of DeBary until now. In the second edition of the _Mycetozoa_, Lister clears the situation by transferring the species to _Physarum_, and calling attention to spore-dimensions. The fact is, the species in external appearance so much resembles _P. cinereum_, that the unaided eye cannot distinguish one from the other. Curiously enough, Rostafinski describes the form he had before him as "one of the rarest." Doubtless had he gone back to his specimens of _P. cinereum_ he had found plenty, for in Europe it seems abundant everywhere. In this country it is _P. cinereum_ as now defined, that is rarer, although not uncommon. From all connection with _Badhamia_, as representing _B. panicea_ it should, as would appear, be withdrawn once for all. 4. PHYSARUM SINUOSUM (_Bull._) _Weinm._ PLATE VIII., Figs. 6 and 6_a_, and PLATE XIX, Fig. 15.