395 



49. Aecidhiin sp. 

 On MALVACEAE: 



Althaea rosea L., Nebraska. 



Sidalcea Candida A. Gray, Colorado. 



Sidalcea Neo-Mexicana A. Gray, Colorado. 

 DISTRIBUTION: Colorado and Nebraska. 



A distinct species formerly confused with Accidiuin interveniens Pk. 

 (.4. roestelioides E. & E.) and Aecidiiiin tuberculatum E. & K. Its thin- 

 walled spores readily distinguish it from the former and the form of its 

 aecia, which are circular in outline, distinguish it from the latter. 



50. Aecidium interveniens (Peck) Farl. Bibl. Index N. Am. Fungi 



1 :5S. 1905. 

 Roestclia interveniens Peck, Bull. Torr. Bot. Club 10:74. 1SS3. 

 Aecidium roestetioides E. & E. Jour. Myc. 1 :93. 18S5. 

 On MALVACEAE: 



CaUirrhoe alccoides (Michx.) A. Gray, Nebraska. 



CallirrJioe digitata Niitt., Texas. 



Malvastrum marnihioidcs Dur. & Hilg., California. 



Malvastrum Thurheri A. Gray, Lower California. 



Sidalcea asprcUa Greene, California. 



Sidalcea Candida A. Gray, Washington. 



Sidalcea delphini folia (Xutt.) Greene, California. 



Sidalcea huniills A. Gray, California. 



Sidalcea mahaefolia (Moc. & Seese) A. Gray, California. 



Sidalcea yeo-Hlexicana A. Gray, Colorado. 



Sidalcea rivularis, Washington. 

 TYPE LOCALITY: Lower California, on Malvastrum Thurheri. 

 DISTRIBL'TION: Nebraska south to Texas, west to Lower California 



and Washington. 

 EXSICCATI: Earth. Fungi Columb. 2Ji01, 3201; Clements, Crypt. Form. 



Colo. 600. 



A strikingly characteristic species readily distinguishable by its very 

 thick-walled spores and deeply lacerate peridium. 



The names Aecidium roestelioides E. & E. and Aecidium interveniens 

 (Pk.) Farl. are here considered as synonyms. Type material has been 

 examined and the two species are thought to be the same. The latter 

 species name has priority, hence becomes the accepted species name. 



