SUMMARYMaireella maculansSydow (1908) onMikania hirsutissimaDC. was rediscovered at Alto da Serra, São Paulo on Jan. 12, 1936, by Krug and Jenkins. This is the type locality for the species so named, for which the genusMaireellaSydow was established. To the synonymy of the fungus, now known asM. bertioides(Sacc.&Berl.) Maubl., is addedDimerosporium aeruginosumWint., based on a specimen collected at São Francisco, Santa Catharina, by Ule.Parodiella caespitosaWint. andLizonia UleanaSacc.&Sydow, which Maublanc placed as synonyms ofM. bertioides, were also described from specimens from this same source.Additional records of this pathogenic species are available as a result of examining certain phanerogamic herbarium material ofMikaniaspp. These are from southern Brazil and in one instance from Costa Rica. Moreover,Achorella costaricensisF. L. Stevens onMikaniasp. from Costa Rica is identified as probably this species ofMaireella, M. bertioides.Setae of bothMaireella bertioidesandM. melioloidesincluding a branched setum of the latter, described by Maublanc, are represented photographically. These are the only species in the genus as monographed by Maublanc.A second species ofAchorelladescribed by F. L. Stevens, viz.,A. guianensisonMikaniasp. from British Guiana, is transferred to the genusMaireellaby the senior author.Uleodothis andinaChardon onM. Ruizianafrom Colombia, which was described somewhat later thanA. guianensisand which was recently transferred to the genusMaireellaby Petrak, appears to be similar toM. guianensis.Haplosporella JusticiaeonJusticiasp. was also collected at Alto da Serra. Formerly this fungus was known only from the Amazon region, where it was discovered by Ule in 1902. Petrak and Sydow, studying Ule's specimen, reported in 1912 that the fruit layer in this specimen was of indefinite character and that the nameH. JusticiaeP. Henn. should therefore be dropped. The more recent gathering from Alto da Serra is unfortunately in no more favorable fruiting condition.Dermatea parasitica(Wint.) Hoehnel, described from material found in Santa Catharina by Ule in 1883 and also collected by Puiggari in Apiahy, 1882–1888, was found by Krug, Jenkins and Costa at Itanhaen in 1936 on leaves of Melastomataceae.The other of the two Discomycetes collected at Itanhaen occurs onBlechnum serrulatum;this appears to be new and is described by the third author asLaetinaevia Blechni.