[33] If a sporangium of _L. tigrinum_ be mounted in water and treated to weak solution of hydro-chloric acid we may easily discover that the crystals, which so wonderfully adorn the outer wall in this and other species, consist, in part at least, of calcium carbonate. We may also discover that in the case before us the crystal or scale lies indeed enclosed in a filmy sac of organic origin, and that could we have seen the outer peridium as it came to form, we might probably have found it made up largely of an ectosarcous foam in whose cavities the excreted calcium found place for tabulate crystallization. In other species listed, conditions are different, and the crystals assume a different shape. The phrase "bicarbonate of lime" quoted in this connection in the former edition of this work from Mr. Massee's _Monograph_, etc., is not clear. [34] Doubtless immature; _v. Mitteil. Naturwiss. Gesell. Wintert._, VI., p. 64, Lister quoted by Schinz. [35] Vid. _Mycologia_, N. Y., Vol. IX., p. 328. [36] See _Addenda, d_, p. 282 following. [37] In the _Mycetozoa_, 2nd ed., p. 158, is cited _Stemonitis virginiensis_ Rex as a synonym of this variety. By reference to p. 163 of the present volume the Virginian stemonitis is left as Rex assigned it, and if the present variety be synonymous, it should be quoted there. The treatment of the species _C. nigra_ in the second edition does not establish such fact, nor with three varieties make for any increasing clearness. [38] It had seemed less necessary to retain the classic orthography in this instance since De Bary and Rostafinski both use _Diachea_. But modern scholarship is nothing if not meticulous; it is the fashion in Latin still to keep the digraph, even to the vexation of all men. In the same way when Bulliard wrote _leucopodia_, 'white stockings', he doubtless meant to be exact. [39] For this citation we are indebted to _Mr. Hugo Bilgram_. ADDENDA a. This volume is as we see, a descriptive list of the various forms of the Myxomycetes in so far as these have come to the personal notice of the writer. Each form is designated, as is usual in discussing objects of the sort, by a particular binomial name, followed, in abbreviated form, by the name of the student or author who in describing the form in question used the combination. Thus _Stemonitis splendens_ was first described by Rostafinski, and the name he thus used is applicable to the form he described, wherever found, and to _nothing else_.