SPEGAZZINI: FUXOI ARGENTINI. 101 



lus sniDerne saepins incrassatus (15-50 mm loiio-. = 5 mm 

 diam. I albescens saepeque compressulns, inferné rotundato- 

 acntatns quandoqne attennatns quandoqne subincrassatus gla- 

 ber, minute denseque fibrilloso-reticulatn.s, deorsiim pallide e 

 cinerascente roseus v. cyanescente-rufescens, tenacellus fissilis, 

 carne flocculosa albo -rosea v. violascente farctus, mycelio 

 parcissimo albo-gossypino radicatus. Sporae ellipsoideae (6-l> 

 ;a long. ^=4-6 !-«■ diam.) laeves, hyalinae non v. 1 -guttulatae. 

 Species Trklioloniati nudo Bull. et Tr. sonUdo Fr. peraffinis 

 sed ut videtur ali utroque sat distincta. 

 28. Tricholoma pampeanum S2)eg. (n. sp.). 



Diag. Caespifosum, píleo appflanato xüuh minusve irregiila- 

 riter fist^o, isabellino laxe mimifeque piilverulento, lamelUs con- 

 f'ertis adnato - siihdeciirrentibus alhís, sHpite hrevi suhterete, 

 sursuní sensim in pileo ampliafo^ pileo paUkUore glabro laevi, 

 .sporis ohfu!<e ellipsoideU laevihus. 



Hah. Non rarnm ad terram in lierbosis nmbrosis prope La 

 Plata, liiem. 1885-95. 



Oh.s: Sj^ecies jjulchella Tr. nielaleuco Pers. (Sacc, I. c, f. 135) 

 ut videtur valde affinis. Caespitosum liygrophanum ; pileus 

 primo ovatus dein explanatus postremo plus minusve concavo - 

 depressus (4-10 cm diam.) centro plus minusve grosse obtu- 

 seque umbonatus laevis, primo integer, serius irregulariter 

 fissas, albo-isabellinus, in sicco umbrinus, minutissime laxe 

 subimperspicueque pruinuloso - pulverulentus ; lamellae con- 

 fertae, membranáceo -crassiusculae, antice attenuatae, postice 

 dilatatae (3-7 mm lat.), primo adnato -rotundatae dein subsi- 

 nuato-decurrentes, acie integerrimae albae immutabiles ; stÍ23es 

 farctus brevis subteres (3-5 cm alt. =^ 10- 15 mm -- diam.) sur- 

 sum gradatim incrassatus ac in jiileo expansus, ad partem 

 superam saepius compressus v. irregulariter subcanaliculatus, 

 ima basi albus farinosus (mycelii causa), superne sordide albus 

 v. jDallide isabellinus laevis glaber v. vix laxissime minuteque 

 longitudinaliter fibrillosus, sub pileo saepius iterum albus sae- 

 peque farinoso -puberulus; caro alba in pilei umbone fere tan- 

 tum evoluta et margine tennis flocculoso-sj)ongiosa hygro- 

 phana exsucca, illa stipitis fibrosa valde scissilis concolor. 

 Sporae ellipsoideae utrimque obtusae (8-10 :-l long. =6-8 ¡a 

 diam.) laeves, liyalinae, granuloso -farctae. Totus fungus in 

 prima aetate rigidulus dein fragilis, cute pilei facillime sepa- 

 rabili atque in fibras solvenda; odor funginus, sajDor parum 

 evolutus amarus. 



