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Page number:149 
Remarks (public):This very small Crucibulum is distinctive in its size, greyish colour, thin-walled peridia, delicate tomentum, and small peridioles. That it is not only morphologically a distinct species but is also genetically isolated was shown by Brodie (1970c), who reported that monospore mycelia failed to show any fertility when they were paired with monospore mycelia of C. laeve. 
Description type:Non-original description 
Description:Crucibulum parvulum Brodie, Can. J. Bot. 48: 848, 1970
Etym.: L. parvulum, very small Figure 53b
Peridia very small, 1.5-3 mm wide at the mouth, 2-4 mm high, white to grey or pale buff, never yellow, strongly obconic and tapering to a narrow base; wall of peridia thin (150 - 180 at lip, ca . 300 µm near base) and brittle, on the outside covered with a fine-textured tufted tomentum, inside smooth shiny, white to pale buff; lip of peridium essentially smooth except for remnants of delicate epiphragm. Peridioles very small, variable 0.5-1.25 mm wide and bearing conspicuous white or pale buff tunica. Spores variable, elliptical, mostly 4-5 x 7-8 µm.
The species fruits on old or dead roots of Juniperus horizontalis and stems of Artemisia spp. in Alberta, Canada, both dry-land plants. It has also been collected in dry areas of Idaho, fruiting upon dead stems of Tetradymia and Atriplex.

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