A Monograph of the Myxogastrex. 25 



A, Capillitium absent. 

 I. HOMODERMEAE. 



Liceaceae. {Ttthulina, LindUadia.) 

 II. Heterodermeae. 



Clathroptycliaccae. {Enteridium, Clathroptychium.) 

 Cribrariaceae. {Crihraria, Dictydium.) 



B. Capillitium present. 



III. C(ELONEMEAE. 



Arcyriaceae. {Pcrichaena, Zachnoholus, Arcyria, Cor- 



nuvia, Lycogala) 

 Trichiaceae. {Hcmiarcyria, TricJda.) 



IV. Stereonemeae. 



Physaraceae. {Badhamia, Physarum, Tilmadochc, Fuligo, 



Leocarpus, Craterimn.) 

 Didymiaceae. {Chondriodcrma, Lcpidoderma, Didymium, 



Spumaria.) 

 Stemonitaceae. {Lamprodcrma, Bncrthcncma, Ancyro- 

 phorus, Comatricha, Stemonitis, Brcfeldia, Ecticularia.) 

 The Myxomycetcs are divided by Schruter^ into three prin- 

 cipal groups as follows — 



A. Mature fructification consisting of a mass of free spores. 

 * Saprophytes ; the amoeboid bodies unite in masses, but 



do not coalesce = Acrasieae. 

 * * Parasitic in the interior of living cells, forming in 

 the known instances, a true plasmodium = Phyto- 

 myxineae. 



B. Spores formed in the interior of sporangia, or on the 



outside of discoid or columnar fructifications = Myxo- 

 GASTRES. 



At the close of the vegetable period, the passage of the motile 

 Plasmodium into the stationary reproductive condition is abrupt, 

 and takes place as follows; the surface of the plasmodium 

 becomes elevated into one or usually many protuberances, the 

 original investment of the plasmodium is continuous over these 

 1 Eiigler u. Prantl.s' Natiirl. Pflaiizenfam., 30 Leif., von Y. Sclirolor, 1889. 



