Entire fructification confluent forming a mucilaginous mass, porose. Pores ample, angulate, at length radiate-dentate. Spores as in the preceding. Plasmodium yellow. Of these two species Fries remarks: "... Duae sunt distinctissimae, inter has vero longa formarum intermediarum series." Famintzin and Woronin not only concur, but consider it were more fitting to place the present species in a distinct genus, as _Polyporus_ is set off from _Hydnum_. A species based upon the color of the vegetative phase only, unconfirmed by any subsequent differential character in the fruit would seem somewhat hazardous. The color of the plasmodium is incident probably to varied nutrient environment. Pores, however, are usually in evidence. Iowa, Tennessee, Missouri, etc.; probably common everywhere. Sub-Class MYXOGASTRES (_Fries_) _Macbr._ 1829. Sub-order _Myxogastres_ Fries, _Syst. Myc._, III., p. 67. 1833. Sub-order _Myxomycetes_ Link, _Handb. der Gew._, 3, p. 405. 1833. Sub-order _Myxomycetes_ Wallroth, _Fl. Crypt._, II., p. 333, in part. 1858. Class _Mycetozoa_ DeBary, _Bot. Zeitung_, 1858, pp. 357-365, in part. 1889. Class _Myxogastres_ Schroeter, _Engl. u. Prantl_, Nat. Pflanz., I., i., p. 16. 1892. Class _Myxogastres_ (Fries) Massee, _Monograph_, p. 28. 1894. Class _Mycetozoa_ Lister, _Mycetozoa_, p. 21, in part. Except as just described, the slime-moulds present abundant, minute, unicellular spores, enclosed in sporangia more or less perfectly defined, and attended by peculiar thread-like structures, free or variously attached and conjoined, the so-called _capillitium_. So far as known, the spores on germination give rise to zoospores, at first amoeboid, later ciliate, again amoeboid, conjugating in pairs, then, in some cases, at least, coalescing and dividing indefinitely to form the plasmodial or vegetative phase.[17] =Key to the Orders of the Myxogastres= Spore-mass black or violaceous, rarely ferruginous Series A Spore-mass never black; usually some shade of brown or yellow, rarely purplish or rosy, etc. Series B SERIES A 1. Capillitium present, delicate, thread-like; sporangia calcareous more or less throughout I. PHYSARALES 2. Capillitium present, thread-like, arising usually as anastomosing branches from a well-developed columella, which in a single genus contains lime; sporangia otherwise non-calcareous II. STEMONITALES SERIES B 3. Capillitium none, or very imperfectly developed; spores of some shade of brown, rarely purplish III. CRIBRARIALES 4. Capillitium the inwardly produced irregular extremities of plates or tubules, which by their interweaving outwardly make up the aethalial wall; spores pale, ashen IV. LYCOGALALES