MYCETES ARGENTINENSES 267 



Obs. Maculae plañe nullae v. partes infectae obsolelissime palle- 

 scenles. Sori amphi^eni, quandoque sparsi, quandoque circi- 

 nantes minuti (0,25 — 0,50 mm díam.), urcdosporici erum- 

 penli-prominuii, pulverulenli e rufo aurantiaci, teleulesporici 

 applanali subsclerotiacei innati, omnes plus minus'''e in 

 eadem parte commixli. Uredosporae globosae (20-25 [x diam.), 

 episporio lenui dense minuteque papuloso vestitae, grosse 1- 

 guttulatae rufo-fumosae; teleutosporae subcylindraceae (60- 

 80 1^- Jong. = 10-15 \j. crass.) saepius geminatim e cellula pro- 

 lifera basali oriuridae, infra médium saepecoarctatulae, laeves 

 ápice truncalae, episporio antice incrassato atque infuscato 

 vestitae. Species M. helioscopiae (Prs.) Cast. peraffinissed notis 

 piurimis ut videtur sat distincta ! 



11. Aecidium RiBESicoLA Speg., n. p. 



Diag. Maculis epiphyllis pallescentibus iiideterminatis, pseudope- 

 ridiis saepius hypophyllis densissime constipatis pulvinulum 

 callosum efficientibus jlavescentibus, aecidiosporis globosis lae- 

 vibus. 



Hab. Ad folia viva Ribis magetlanici in montanis prope Lago 

 Nahuel-huapi, Dec. 1897. 



Obs. Foliicola rarius pelioli- v. flori-cola; maculae íere nullae 

 oppositae indeterminatae saepius pallescentes atque concaviu- 

 sculae; pseudoperidia minuta (0,5-0,7 mm alt. =^0,20 — 0,25 

 mm diam.) densissime constipata atque pulvinulum sat pro- 

 minulum superne applanatum ostiolato-alveolatum, margine 

 obtusum repando-orbiculatum (2-6 mm diam.) efficientia, 

 pallide flavescentia; túnica pseudoperidii tenui alba e cellulis 

 hexagonis (25-30 \). diam.) crasse tunicatis, dense minuteque 

 verruculosiseííormata ; aecidiosporaeglobosae (22-25 [j. diam.) 

 episporio laevissimo tenui hjalino tectae, intus nubiloso-farc- 

 tae aurantiacae. 



12. Uredo boopidicola Speg., n, sp. 



Diag. Maculis fere nullis, soris parvulis sparsis subhemisphaeri- 

 cis atro-ferrugineis, uredosporis subglobosis laevibus maju- 

 sculis. 



Hab. Ad folia viva lioopidis squarrosae prope Chonkenk-aik, secus 

 Rio Chico, Feb. 1898 (leg. C. Ameghino). 



Obs. Foliicola, rarius caulicola; maculae quandoque nullae. 



