_Physarella lusitanica_ Torrend is a globose form depressed above or betimes discoidal, occurring on Eucalyptus trees in Portugal. _P. oblonga_ is so variable in form that it sometimes suggests a different genus. Forms of it have been mistaken for _Fuligo gyrosa_ R., etc. Professor Torrend would include here _Physarum javanicum_ (Rac.), i. e. _Tilmadoche javanica_ as Raciborski saw it! We may not too often reflect that genera are purely artificial things set up for our convenience; but surely _Physarella_ as a natural genus is distinct enough to all. =6. Cienkowskia= _Rost._ 1873. _Cienkowskia_ Rost., _Versuch_, p. 9. Fructification plasmodiocarpous, irregularly dehiscent, the wall a thin cartilaginous membrane destitute of lime, except the capillitial attachments within; capillitium scanty but rigid, and characterized everywhere by peculiar hook-like branchlets, free and sharp-pointed, the spores as in _Physarum_, etc. The genus contains, so far, but a single species:-- CIENKOWSKIA RETICULATA (_Alb. & Schw._) _Rost._ PLATE XIV., Figs. 2, 2 _a_, 2 _b_. 1805. _Physarum reticulatum_ Alb. & Schw., _Cons. Fung._, p. 90. 1829. _Diderma reticulatum_ Fr., _Syst. Myc._, III., p. 112. 1873. _Cienkowskia reticulata_ (Alb. & Schw.) Rost., _Versuch_, p. 9. Plasmodiocarp an elongated, irregularly limited, close-meshed net, closely applied to the substratum, the wall thin, transversely rugulose, and roughened, dull orange-yellow, splashed here and there with scarlet, anon entirely red, within marked by transverse calcareous ridges, supporting in part the calcareous system of the capillitium; capillitium of delicate, rigid, reticulating yellow tubules or threads with numerous free, uncinate or sickle-shaped branchlets, and large, irregular, calcareous plates, more or less transverse to the axis of the sporangium, attached to the peridial walls, as if to form septa, ordinary calcareous nodules few; spore-mass jet-black, spores, by transmitted light, violaceous, minutely roughened, 9-10 mu. A very rare species, as it appears, easily recognized by the Coddington even, much more by the microscopic characters quoted; probably often overlooked by the collector, as to the naked eye it presents the appearance of some imperfectly developed, dried-up plasmodium. Very unlike _Physarum serpula_ Morgan, not infrequently offered by collectors as _Cienkowskia_. It is _Diderma reticulatum_ of Fries, who, strangely enough, thought it might be a plasmodial phase of _Diderma_ (i. e. _Leocarpus_) _fragile_ (_Syst. Myc._, III., p. 102). Eastern United States, Europe, Java, Ceylon, California. See under _L. fragilis_, next following. =7. Leocarpus= (_Link_) _Rost._ 1809. _Leocarpus_ Link, _Diss._, I., p. 25.