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Page number:147 
Remarks (internal):A single character would serve to separate the genus from all others in the Nidulariaceae. Lloyd's description of this feature is as follows: 'The funiculus is a simple, thin cord, capable of long extension when wet. It is attached to a little nipple-like protuberance on the peridiole.'
Old specimens of Nidula or even of small species of Cyathus are frequently mistaken for Crucibulum but, if peridioles are present, one glance at the little button-like purse at the apex of the funicular cord (figure 38c) is sufficient to identify Crucibulum ; no purse in Cyathus is remotely like it and there is no funiculus in Nidula.
One other character of Crucibulum should be emphasized. The peridioles are provided with a thick and persistent tunica, from which they appear white or light buff when fresh and conspicuously white in age (figures 38c, 53b) ; such light-coloured peridioles are not found in other genera with which Crucibulum could be confused.
Crucibulum has long been considered to be a monotypic genus. Although many 'species' have been described, Lloyd (1906) and others have taken the position that, because there are so many variants towards and away from typical C. laeve (known in older literature as C. vulgare), the designation of these variants as species is not justifiable. Where intermediate forms of C. laeve exist in similar habitats and close proximity, J likewise have considered taxonomic separation unwise. However, recently two kinds of Crucibulum have received attention which fit neither Tulasne's original description of C. laeve nor the various expanded versions of that description that have been commonly used. On the basis of morphological distinctness, difference in habitat and distribution, and (for one species) genetic isolation, I have added C. parvulum (figure 53b) and C. cyathiforme orme (figure 53c) to the genus (Brodie, 1970c, 1971c).
Crucibulum is separated from Cyathus by the thick peridium wall consisting of a single layer of hyphae as well as the funiculus of simple structure; from Nidula it is separated by the presence of a funiculus.
 
Description type:Non-original description 
Description:Crucibulum Tulasne, Ann. Sci. Nat. Ser. iii, Vol. 1: 89, 1844
Etym. L. (Medieval) Crucibulum, crucible, melting pot
Type species: Crucibulum laeve (Huds.) ex Relh. Kambly; Kambly and Lee, Univ. of Iowa Stud. Nat. Hist. 17 (4): 167, 1936
Tulasne's rather lengthy description of the genus may be reduced to the following essentials. Fruit body short cylindrical, sessile (figures 21, 38c, 43, 53) ; peridium of a single layer, thick, the exterior velvety or woolly when young, becoming smooth with age; interior pale, smooth, the epiphragm covering the mouth, disappearing at maturity and exposing the numerous peridioles; peridioles disk-shaped, pale, covered by thick tunica and attached to the peridiole wall by a simple funiculus, the upper end of the funicular cord being attached to a conspicuous nipple-like protuberance on the under surface of the peridiole.
 
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