395 



49. Aecidiuin s\). 

 On MALVACEAE: 



Althaea rosea L., Nebraska. 



Sidalcea Candida A. Graj', Colorado. 



Sidalcea Neo-Mexicana A. Gray, Colorado. 

 DISTRIBUTION: Colorado aud Nebraska. 



A distinct species formerly confused with Acciditim interveniens Pk. 

 {A. roestelioidcs E. & E.) and Aecidiuin tiihcrculation E. & K. Its thin- 

 walled spores I'eadily distinguish it from the former and the form of its 

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



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



1 :5S. 1905. 

 Roestelia interveniens Peck, Bull. Torr. Hot. Club 10 :74. 1SS3. 

 Aecidium rocstelioides E. & E. Jour. Myc. 1 :93. 1SS5. 

 On MALVACEAE: 



Callirrhoe alceoides (Michx.) A. Gray, Nebraska. 



CaUirrhoe digitata Nutt., Texas. 



Maivastrum ma r nil) io ides Dur. & Hilg., California. 



Malvastriini Tliurhcri A. Gray, Lower California. 



Sidalcea asprella Greene, California. 



Sidalcea Candida A. Gray, Washington. 



Sidalcea del pJiinJ folia (Nutt.) Greene, California. 



Sidalcea liumilis A. Gray, California. 



Sidalcea malvaefolia (INIoc. & Seese) A. Gray, California. 



Sidalcea yco-Mexicana A. Gray, Colorado. 



Sidalcea rivularis, Washington. 

 TYPE LOCALITY : Lower California, on Maivastrum Thurberi. 

 DISTRIBUTION: Nebraska south to Texas, west to Lower California 



and Washington. 

 EXSICCATI: Barth. Fungi Columb. 2-'i01, 3201; Clements, Crypt. Form. 



Colo. 600. 



A strikingly characteristic species readily distinguishable by its very 

 thick-walled spores and deeply lacerate peridium. 



The names Aecidiuin roestelioidcs 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. 



