MYXOGASTRES 21 



1894. Ceratiomyxa mucida Schroet. var. porioides Lister, Mycetozoa, p. 26. 

 1899. Ceratiomyxa porioides Alb, & Schw. (Schroet.), Macbr., A^. A. S., p. 19. 

 1911. Ceratiomyxa porioides Alb. & Schw., Schroet., List. Mycet., p. 26, var. 



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: ". . . Duse sunt distinctis- 

 simae, inter has vero longa formarum intermediarum series." Fam- 

 intzin 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 Hydnmn. A species based upon the color of the vegeta- 

 tive 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., IL, 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 per- 

 fectly 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.^ 



1 See Jahn, Myxomyceten Studien No. 8, Berlin 1911. 



