94 
Journal of Mycology 
[Vol. 12 
sulcate, convex then expanded. Stipe thickest at the apex, taper¬ 
ing downward, black, white-pruinose, the base insititious. Lamel¬ 
lae pure white, unequal, some of them forked, adnate, the inter¬ 
stices venulose; spores hyaline, stellate, 3-5-rayed, the expanse 
of the rays 8-9 mic. 
Growing on old leaves, sticks, etc. Pileus 1-2 cm. in diam- 
ter, the stipe 2-3.5 crn * l° n g and 1-2 mm. thick. In the dry state, 
the lamellae are changed to flesh-color or rufous and red-brown, 
the stipe loses its black color and pileus and stipe become uni¬ 
formly alutaceous. The pruinosity on the stipe and pileus consists 
of imperfect fiocci and minute glittering cells. 
6. PIELIOMYCES VIALIS Morgan. Marasmius vialis 
Peck. 51 N. Y. Rep. 1897. 
Pileus membranaceous, convex, pruinous, white. Stipe short, 
tough, solid, at first white, then brown or blackish, but covered 
with a white pruinosity, commonly swollen at the base into a 
small downy bulb. Lamellae arcuate, distant, decurrent, white. 
Growing on damp ground by the roadside. Pileus 4-10 mm. 
in diameter, the stipe 1-2 cm. long and about 1 mm. thick. This 
fungus has almost the same style of coloration as Marasmius 
nigripes. 
Index to the Species of Marasmius and Heliomyces. 
acerinus, 11:203 
aciculiformis,ll :245 
aculeatus. 12 :6 
albiceps, 12:5 
albo-fuscus, 12 :5 
albo-marginatus, 11:244 
alliaceus, 11:239 
androsaceus, 11:245 
anomalus. 11:208 
arachnoideus, 12:8 
archyropus, 11: 208 
asperifolius, 12 :8 
atro-rubens, 12 :2 
atro-viridis, 11:233 
badiceps, 11:234 
badius, 11:209 
bambusinus, 11:245 
bellipes, 11:207 
bermudensis, 11:237 
bertoroi (Hel.) 12:93 
biformis, 11:204 
bombycirhiza, 11:207 
brevipes, 11:240 
caespitosus, 12 :7 
calosporus, 12 :8 
calopus, 11:235 
campanulatus, 11:242 
candidus, 11:212 
capillaris, 11:247 
catervatus, 11:211 
chrysochaetes, 12 :1 
clavaeformis, 12 :6 
cohaerens, 11:238 
coilobasis, 11:210 
concinnus, 11:212 
concolor, 12 :7 
copelandi, 11:202 
coracicolor, 11:233 
coracipes, 12 :7 
corrugatus, 11:210 
cubensis, 11:237 
cucullatus, 11:210 
cucurbitula, 11:238 
curreyi, 12:1 
curtisii, 12 :7 
cyathiformis, 12:4 
dealbatus, 11:237 
decolorans (Hel.) 12: 
decurrens, 12 :6 
delectans, 11:206 
dichrous, 11:211 
epiphyllus, 12 :3 
erythropus, 11:207 
fagineus, 11:204 
felix, 12 :2 
ferrugineus, 11 :241 
fibrosipes, 11:205 
filipes, 11:247 
floriceps, 11:234 
foetens (Hel.) 12:93 
fulviceps, 11:243 
fusco-purpureus, 11:206 
glabellus, 11:242 
glancopus, 11:235 
glebigenus, 11:242 
graminum, 12:1 
gregarius, 11:236 
haematocephalus, 11:241 
hawaiensis, 12 :8 
helvolus, 11:245 
hinnuleus, 11:243 
hirtipes, 11:240 
hyperellus, 12 :4 
hypophaeus, 11:243 
inaequallis, 11:244 
insititious, 12 :2 
juglandis, 11:236 
lachnophyllus, 11:239 
lanatus, 11:204 
languidus, 12:4 
leptopus, 11:234 
leucocephalus, 12:5 
longipes, 11:240 
macrorrhiza, 11:239 
melanopus, 11:245 
merulinus, 12 
minutissimus, 12:3 
minutus, 11:246 
multiceps’, 11:240 
nidulus, 12 :8 
