. Cronartium comandrae in the Rocky Mountain States. Cronartium comandrae Rocky Mountains Region; Fungi Rocky Mountains Region. Table ^.-Influence of time on germination of urediniospores at cool, moderate, and warm temperatures Germination Mean germ tube length jjj^g Temperature (degrees C.) Temperature (degrees C.) (hours) 8 18 28 8 18 "28" Percent Microns 3 86 96 67 53 157 64 6 .95 94 87 135 270 84 12 93 96 76 311 376 109 24 99 98 83 420 520 116 48 96 99 88 450 541 124 Effects of Temperature on Germination Method.—ViQsh. telia from inoculated comandra in a greenhouse were placed i
. Cronartium comandrae in the Rocky Mountain States. Cronartium comandrae Rocky Mountains Region; Fungi Rocky Mountains Region. Table ^.-Influence of time on germination of urediniospores at cool, moderate, and warm temperatures Germination Mean germ tube length jjj^g Temperature (degrees C.) Temperature (degrees C.) (hours) 8 18 28 8 18 "28" Percent Microns 3 86 96 67 53 157 64 6 .95 94 87 135 270 84 12 93 96 76 311 376 109 24 99 98 83 420 520 116 48 96 99 88 450 541 124 Effects of Temperature on Germination Method.—ViQsh. telia from inoculated comandra in a greenhouse were placed in petri-plate moist chambers maintained at various temperatures, to an accuracy of about ±° C. Excised telia were attached vertically by their bases on 2 percent water agar on the insides of plate covers. When teliospores germinated, basidiospores fell onto plates containing 2 percent water agar (adjusted with HCl to pH approximately to prevent germination of the basidiospores, which makes counting difficult). After 3, 6, 12, 24, 48, and 72 hours, the covers were rotated by hand so that time of spore casting could also be determined. Teliospore germination was evalu- ated by counting the basidiospores cast from whole teha. /? casts of basidiospores were produced at temperatures of 13° to 23° C; casts were fair but slower at 8° C, and poor at 6° and 24° C. (fig. 8). No basidiospores were cast at 3° or ° C. and higher. At ° C, basidia formed but no basidiospores developed. At 28° and ° C, not even basidia formed. Comparisons by Duncan's New Multiple Range Test (Duncan 1955) at the level indicated that the excellent casts at temper- atures 13° to 23° C. were not significantly different from each other at 12 and 24 hours, but were better than casts at other temperatures and continued to be greater throughout tlie remainder of the 72-hour incubation period. In other similar tests the relative position of the maximum casts vari
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