SPEGAZZINI: MYCETES ARGENTINENSES. 169 
attenuato e livido aurantio subglaucescente, sporis laevibus 
ovatis. 
Hab. Ad terram in pratis editioribus prope Montevideo, Maj. 1898 
(leg. CL J. J. Arechavaleta). 
Obs. Solitaria v. paucigregaria. Pileus hemisphaericus (10-15 mm 
dm.) convexus, carnosulus, exumbonatus, centro glaber v. pul- 
visculo heterogeneo adspersus, margine integer, in juventute 
suvinvolutus; caro tenuis flocculosa citrina; lamellae subangu- 
stae atque subceonfertiusculae, acie integrae polymacriae, antice 
acutae postice truncato-adnatae denticuloque breviter decurren- 
tes, primo citrinae, dein nubecula ex albo violascente velatae ; 
stipes erectus flexuosulus, saepius compressus saepeque longitu- 
dinaliter grosse pareeque sulcatus (20-25 mm no =25:5- mu 
erss.) basi attenuatus apice abrupte in pileo expansus, glaber 
laevis, inferne citrinus, medio flavus, superne aurantius et saepe 
glauco-pruinulosus, intus latissime fistulosus. Sporae ovatae v. 
ellipticae (121 1ng.= 6-7 4 dm.) nubiloso-farctae, hyalinae. 
4. CLAUDOPUS ARGENTINENSIS Speg. (n. sp.) 
Diag. Major, hemisphaericus, viz inaequilateralis subargenteus, 
púleo viz centro carnoso, lamellis latis confertis a stipite remotis 
ex albo roseo-carneis, stipite farcto elongatulo albo-fibrilloso v. 
subreticulato. 
Hab. Ad truncos emortuos putrescentes Eucalypti globuli, Parque 
de La Plata, Mart. 1898. 
Obs. Pileus irregulariter orbicularis (8-9 em dm.) et leniter inae- 
quilateralis, horizontalis convexus, centro late obtuseque umbo- 
natus margine incurvulus integer v. vix sinuoso-repandulus, cute 
tenui saepius radiatim minute fibrilloso- rimosa sordide argentea 
v. subcinerea, in vivo subviscosa, in sieco subsericea vestitus; caro 
candida immutabilis, in umbone floceuloso-compactiuscula super 
lamellas tenuissima vix evoluta, cum illa stipitis continua. Lamel- 
lae segmentiformes tenuiusculae (10-12 mm lt.) membranaceae 
confertiusculae polymacriae, pro ratione latissimae, antice atte- 
nuato-rotundatae, postice abrupte subtruncato-rotundatae a sti- 
pite remotae, primo-albae, dein roseae, postremo pallide carneae. 
Stipes lateralis adscendente-incurvus teres (7-8 em Ing. =6-7 
mm erss.), insititius, intus faretus albus, extus albus v. subpal- 
lescens saepius plus minusve obsoleteque fibrilloso-reticulatus v. 
fibrilloso-striatus. Sporae carneae pulverulentae, ovatae, inaequi- 
laterales (84 Ing. =4 u1t.) laeves. 
