110 University of California Publications in Botany t VoL - 7 



Uredinia and telia occur on the leaves of the same hosts, but as the 

 sori are small they are easily overlooked. The genetic connection 

 between the two forms has not been proven; but the frequency with 

 which they are associated makes it probable that they are so related. 

 It is common throughout the bay region and in southern California. 



17. Eriosporangium punctato-striatum (Dietel and Neger) Arthur 



Bot. Jahrb., vol. 22, p. 357, 1896; N. A. Flora, vol. 7, p. 213, 1912. 



Aecia on stems and leaves on Baccharis viminea DC, but does not 

 produce conspicuous galls. 



Uredinia and telia on the same host (type of Puccinia Baccharidis 

 Diet, and Holway), Santa Rosa, Los Gatos, Pasadena (McClatchie), 

 San Bernardino (Parish), Paso Robles (Bethel), San Ysidro (Bar- 

 tholomew), Lakeside (Bethel). 



GYMNOSPORANGIUM HEDW. 

 Flora ,franaise, vol. 2, p. 216, 1805. 



Aecia usually cylindrical but rarely cupulate ; peridia membranous, 

 the cells imbricate. Uredinia with one exception lacking. Telia 

 naked, gelatinous, and somewhat elastic when mature ; teliospores two- 

 celled, sometimes three- to five-celled, by transverse septa, pedicels 

 hyaline, usually long. 



18. Gymnosporangimn Blasdaleaimm (Diet, and Holw.) Kern 

 I, III 



Erythea, vol. 3, p. 77, 1895; Kern, Bull. N. Y. Bot. Gard., vol. 7, p. 437, 

 1911. 



Aecia on Amelanchier alnifolia Nutt. and Cmtegus rivularis Nutt., 

 Sisson and Shasta Springs, type collection ; on Amelanchier alnifolia 

 Nutt., Hoopa Valley, Plumas County (Meinicke), Yosemite Valley 

 and Lake Tahoe (Bethel), on Amelanchier pallida Greene and Cra- 

 tegus Douglasii Lindl., northern California (Kern.). This has the 

 well developed peridium of a typical aecidium. 



Telia on Libocedrus decurrens Torr. Sisson, Hoopa Valley, Sis- 

 kiyou County (Copeland), Potter Valley (Purpus), Yosemite Valley 

 and Lake Tahoe (Bethel) ; "widely distributed throughout the north- 

 ern part of the state" (Meinicke). It sometimes produces witches' 

 brooms of some size, but the spore masses, which appear as brown 

 cushions on the smaller twigs and leaves, are not conspicuous. 



