The veiled species of Hebeloma in the western United States / Alexander H. Smith, Vera Stucky Evenson, and Duane H. Mitchel.

Introduction

13

mm high-dry objective and a 12-x eyepiece. With this optical system
those species with very slightly ornamented spores appear smooth or
practically so. To describe this degree of ornamentation we have often
used the term apparently smooth. In the final publication on the North
American species of Hebeloma it is planned to treat spore ornamentation in greater detail.
There are species, however, in which spore ornamentation is obvious under the 3 mm objective, and this degree of ornamentation is
13
14
5 2
16 17
l 18\ 19 1 20 H 27
15
Figs. A1l-27. Terminology of Cheilocystidia: fig. 11, basidiolelike; fig. 12, saccate; fig. 13, fusoid-ventricose; fig. 14, subutriform (basal enlargement only slightly
greater than that of the rounded apex); fig. 15, filamentous; fig. 16, narrowly fusoid-ventricose with elongated neck and apex + acute; fig. 17, elongate-clavate with flexuous side
walls; fig. 18, filamentous-capitate; fig. 19, fusoid-ventricose with + clavate apex; fig. 20,
+ tibiiform (neck narrow, base and apex inflated); fig. 21, fusoid-ventricose with greatly
elongated neck and obtuse apex; figs. 22, 23, and 24, fusoid-ventricose with wavy side
walls; fig. 24, fusoid-ventricose with a secondary cross-wall distal to the basal inflated
portion; fig. 25, apex of cystidium showing a developing bifurcation; fig. 26, a side branch
developing on neck of a cheilocystidium; fig. 27, a small (but mature) fusoid-ventricose
cystidium with a hyaline "slime-cap."