22 6 GENERAL INDEX 



potassium sulphide as a fungicide, 21 



potato rot, 31 



powdery mildews, 1 8, 40 ; parasitic fungi belonging to the Perisporiales 



preservation of fungi, methods of, 202-206 



promycelium, the early hypha produced by a germinating spore 



pseudoperidium, a membraneous covering to certain aecidial spores 



puff-balls, 8l, 136, 137, 141 ; subterranean, 135]; thick-skinned, 143 



pycnidia, 68 ; perithecia-like cavities producing spores from the inner 



surface of their walls 

 Pyrenomycetes, 36 ; an obsolete group name for the Sphaeriales and their 



allies 

 pyriform, pear-shaped 



Receptacle, 34 



respiration in plants and animals, 9 



resupinate, without a pileus 



Rhode Island, exploration for fungi in, 191 



ripe rot, 73 



rusts, 80 ; parasitic fungi belonging to the Uredinales 



S accardo, Contribution to mycology by, 158 



salmon disease, 22, 29 



saprophyte, a fungus growing on dead organic matter 



scab, 75 



Schweinitz, contribution to American mycology by, 1 60 



sclerotia, 43 ; hard bodies which serve as receptacles of reserve food ma- 

 terial 



sea lettuce, 9 



sea weeds, 8, 9 



seed plants, 8, 9 



septa, 13 ; partitions extending across the tube of a hypha or a spore 



sinuate, with a notch near the junction with the stem (PI. 7. f. 2} 



slime-moulds, 146, 149 ; relation to protozoans, 152 ; relation to bacteria, 

 152; relation to moulds, 152 



smoke-balls, 136 



smut in grain, 20, 21 



smuts, 80 ; parasitic fungi belonging to the Ustilaginale 



sorus, a mass of spores breaking through the epidermis of a host plant 



South Carolina, exploration for fungi in, 192 



South Dakota, exploration for fungi in, 192 



spennatia, 88 ; spore-like bodies produced from spermogonia 



spermogones, the same as spermogonia, q. v. 



spermogonia, 88 ; a form of reproduction among the Uredinales whose re- 

 lations are imperfectly known 



sporangia, 147 ; spore cases 



sporangioles ; spore receptacles with persistent walls, found in the Nidula- 

 riales and their allies 



spores, color of, 15; shape of, 1 5 



spore-prints, ill 



spring mushroom, 144 (see also morel) 



sterigmata, 14 ; slender projections from the basidia which bear spores 



