POETO RICAN FUNGI. 129 



time is given as a rule. In some instances the first collection found 

 in working up the list has been used. 



Those who have made the collections represented in the herba- 

 rium of the Insular Experiment Station are Mr. John R. Johnston, 

 pathologist 1910-1914, to whom credit is due for initiating not only 

 the herbarium but the other botanical work of the Station ; the writer, 

 assistant pathologist 1913-14, pathologist and botanist to date; Mr. 

 R. C. Rose, assistant pathologist 1916-17. 



No attempt has been made at a critical study of the species listed. 

 It is realized that many of those given will in the course of time be 

 reeombined, reduced to synonomy, or . otherwise changed in name, 

 but neither time nor facilities are available here for systematic work 

 of this nature. The system of classification used is entirely one of 

 convenience and has no other significance, either as a proposed new 

 plan, or even as the personal views of the writer. 



MYXOMYCETES.^ 

 CERATIOMYXACE^. 



Ceratiomyxa fructiculosa (Muell.) Macbr. 

 On rotten wood, Palo Seco. 



PHYSARACE^. 



Physarum cinereum (Batsch.) Pers. 



Fruiting on living leaves and stems of Phaseolus vulgaris, Sac- 

 charuni officinarum, Lactuca sativa, Vigna ungmculata, and 

 other plants, Rio Piedras, Martin Peiia, Manati (48). 

 Physarum columbinum (Rost.) Sturgis. 



{Tilmadoche compacta [Wing.] McB.) (82). 

 On rotten wood, Rio Piedras. 

 Physarum compressum Alb. & Schw. 



On Sugar-cane debris, Cortada (48). 

 Physarum didermoides (Ach.) Rost. 



On rotten wood, Rio Piedras. 

 Physarum pusillum (B. & C.) List. 



{Physarum nodulosum [Cooke & Balf.] Mass.) 

 On rotten sacking, and also found fruiting on living sugar-cane 

 leaves, Rio Piedras (48). 

 Physarum viride (Bull.) Pers. 



On rotten wood, Moca, Rio Piedras. 



^ The determinations in this group were made for the most part by Dr. William C. Stnrgis. 



