254 ANALES DE LA SOCIEDAD CIENTÍFICA ARGENTINA 



pantem, albam, majusciüe cellnlosain effoTmans; gleba base peri- 

 dioque adnata, primo carnosa alba, dein lutescens, postremo oli- 

 Tascens, flocculoso-pulverulenta ; flocci gráciles (4-5 crass.), 

 levissinii, ramulosi, parce septati, chlorini; sporae globosas 

 (5-5,5 diam.), grosse 1-guttulatae, levissimae, dilute olivas- 

 centes, 



* Piálense Speg. Peridia magis globulosa, minora (18-20'" 

 diam.=14-16"'crass.), basis non v. yíx plicato-salcatuLi; cor- 

 tex exterior ubique subaequaliter in verrucis gracilibus, longiu- 

 sculis, aciitis, densissimis fractus ; cortex interior dilute gilvo- 

 olivascens, tenuissime papyraceus, etiam in scnectute frustulis 

 corticis exterioris vestitus ; basis cellulosa, bene evoluta, al- 

 bescens, vix tertium infenim peridii occupans; gleba cortice ad- 

 nata, ciim base peridioque continua, fulvo-virescens, v. tabacino- 

 olivascens, flocculoso-stipata, pulverulenta; flocci gráciles (3-5 

 crass.), ramulosi, septati, o'ivacei; sporae globosae (3-5 diam.), 

 grosse 'j-guttulatae, levissimae, chlorinae. 



Haec forma inter L. gemmatum Batsch. et L. asperum (Lev.) 

 media et facillime omnes ad unain satis yariabilem rediicendae 

 Tidentur. 

 Hab. In pratis praecipue locis subarenosis sterilibusque (an ad 

 radices graminearum?) in pampa prope los Montes Largos, 

 Tuyú, Jan. 1881. 



MYXOMYCETEAE DBry. 



257. Leocarpus melaleucus Mtgn. Ann. Se. nat. S. III, v. IV, 

 p. 141. 



Hab. Ad folia, caules, cortices viva v. emortua in berbosis uligino- 

 sis, Eocoleta, Maj . 1 881 . 



Obs. Sporangia elliptica densiuscule sparsa (0,8-1,3'" long, =0,5- 

 0,7'" crass.); cortex longitudinaliter rimóse debiscens, diu val- 

 vato-apertus, dein frustnlatim evanescens, crassus, fragilis, cal- 

 careus extus pallescens intus candidns, a gleba plañe discretus, 

 et post dehiscentiam mox vacuus ; gleba compacta, dura, a cor- 

 tice perfecto libera, membrana teuui, liyalina, arete adnata invo- 

 luta ; sporae globosae, leves (8-1 diam.), violaceo-f uscae, cristal- 

 lis hyalinis majusculis immixtae; capillitium non vidi. 



