Tulostoma occidentale Lloyd (Fig. 107; Pls. XXVII: 4:XLVII:1) - The Tylostomeae, p. 13, tab. 76, figs. 1-2. 1906.
Etym.: The name refres to its Western distribution (in the United States).
Spore-sac up to 12 mm diam, globose-depressed. Exoperidium hyphal, with sand grains mixed with clay particles, deciduous in patches, not membranous. Endoperidium finally smooth, whitish pinkish. Mouth tubular, slightly projecting, becoming easily torn and sometimes can be mistaken for a fibrillose one. Socket very conspicuous and separated from the stem, membrane subentire. Gleba light ochraceous. Stem up to 50 x 4 mm, whitish to wood-colour with reddish hues, longitudinally rugose to substriate, helicoidally fibrillose.
Spores globose, apiculate, slightly verrucose to punctate under L.M.; 4-4.7 µm diam. Under SEM the ornamentation appears as densely crowded irregular, blunt verrucae. Capillitium slightly brownish to hyaline, frequently branched and septate; threads thick-walled, with visible lumen which is usually wide, disjointable and much swollen at the mostly oblique coloured septa; 4-10.1 µm diam.
Habitat: clayish soil.
Distribution: North America: W and S United States. South America: S and W Argentina.
Holotype: United States, Washington, leg. Suksdorf (Herb. Lloyd no 54.739, BPI!).
