114 Natural History Bulletin. 



CERATIOMYXA, Schrceter. 



[Ceratium^ Albertini and Schweinitz.) 



Plasmodium in rotten wood, white or nearly transparent; 

 when fruiting, forming on the substratum mould-like patches 

 composed of the minute sporiferous pillars, generally in clus- 

 ters of three or more together. 



2. Ceratiomyxa mucida, Persoon. Plate I, Figs. 7 and *]a, 



(C. hydnoides^ Alb. and Schw.) 



Rather rare, but occuring in summer on shaded rotten logs, 

 especially after warm showers and in sultry weather. Easily 

 distinguishable from all similar moulds by the absence of 

 mycelium or of anything like a hypha. 



II. LICEACEiE. 



Fruit consisting of distinct sporangia, plasmodiocarps or 

 aethalia. Peridia membranaceous, without reticulate thicken- 

 ings, opening irregularly at maturity. Capillitium none. 



KEY TO GENERA. 



Fruit consisting of distinct sporangia, or plasmodiocarpous ; spores 



brown, LiCEA. 



Fruit of many united sporangia. 



a. Single sporangium prismatic, long tube like, . . . Tubulina. 



b. Single sporangia very short, cell-like, at maturity no 



longer individually distinguishable, .... Lindbladia. 



TUBULINA, Persoon. 



Sporangia cylindric, or by mutual pressure prismatic, fas- 

 ciculate, unitedly forming a large sethaHoid mass, resting upon 

 a strongly developed, sometimes columnar, hypothallus. 



3. Tubulina cylindrica, Bulliard. Plate I, Fig. 4, and 



Plate VII, Fig. 8. 

 Sporangia united into a single cluster or in lesser gregari- 



