ADDENDA 



287 



Stemonitis smithii . . . . 

 Comatricha longa . . . . 



Comatricha irregularis . . 



Comatricha nigra . . . . 

 Comatricha typhoides 



Diachaea splendens . . . 

 Enerthenema papillatum 



Reticularia lycoperdon . . 

 Dictydiaethalium plumbeum 



Lindbladia effusa . . . . 

 Tubifera ferruginosa . . . 

 Cribraria dictydioides 

 Cribraria tenella , . . . 

 Cribraria cuprea .... 



Arcyria nutans 



/Ircyria denudata . . . . 

 Arcyria cinerea . . . . 

 Trichia varia 



green to yellow to reddish purple 



white, cream-yellow, reddish purple to 

 dusky 



white 



white 



bluish white 



pure white 



colorless or greenish 



white 



colorless, pink, salmon, rose, orange, choc- 

 olate brown 



brown, lead-colored 



watery white, scarlet, brown, almost black 



clear dark green 



watery, dark plumbeous, bronze 



red 



white 



watery white, then flesh-color 



grey, then white 



colorless, then white 



h. In a few instances references to illustration do not find place 

 in connection with the descriptive matter. One phase of Physarum 

 albescens is figured on PI. III.; Mucilago will be found portrayed on 

 PI. VII.; Physarum viride on PI. VIII. 



j. The group before us has research possibilities not a few. The 

 question of their nutrition and its limits in respect of variety, is 

 yet to be solved. From present indications all that can be said is to 

 the effect that a pabulum similar in variety, no doubt meets the 

 needs of many species. Whether in artificial culture a single base 

 as gelatin or agar would suffice for all or several is yet to be dis- 

 covered. 



Whether a species brought from spore to maturity on artificial 

 diet would conform in any reasonable way to our dim concept of its 

 identity is also, it would seem, a problem. The variation in the 

 field would seem to make it doubtful. 



From the table immediately preceding it is plain that there is 

 place for doubt. Color it is surmised is of itself everywhere inci- 

 dental; the structure, which maintains identity or the reverse, lies 



