Key to 25+ North American Stinkhorns
Note: Some species from Central America have been included on the assumption that they may range into tropical and subtropical regions of North America. Some non-North American stinkhorns are treated at the site, but not in the key below. They include Clathrus baumii, Clathrus transvaalensis, Colus pusillus, Ileodictyon cibarium, Ileodictyon gracile, Phallus aurantiacus, Phallus cinnabarinus, Phallus multicolor, and Lysurus corallocephalus. It should also be noted that stinkhorns are notorious for appearing where they are not supposed to appear, geographically, since they are easily spread through human endeavors.
|1.||Spore slime occurring on a ring (reminiscent of a napkin ring) near the top of a white stinkhorn with Swiss-cheese-like holes; subtropical to tropical.|
|2.||Spore slime occurring near the top of an unbranched structure (a stem that does not split into separate arms, columns, claws, or tentacles), on the outer surface.|
|2.||Spore slime occurring on the inner (rarely on the outer) surfaces of a branched, latticed, or columned structure which may or may not sit on top of a stem.|
|3.||Without a clearly distinct "head" or "cap" to bear the spore slime (in other words, the spore slime merely covers the surface of the stem, usually toward the top).|
|3.||With a distinct "head" or "cap," separated from the stem (but possibly collapsing against it), bearing the spore slime.|
|4.||Mature stem orange or reddish orange.|
|4.||Mature stem without orange shades: pink, red, or white.|
|5.||Spore slime covering only 2–3 cm, the tip of the stem abruptly rounded; spores 3.5–5 x 1.5–2 µm.|
|5.||Spore slime covering more than 2–3 cm, the stem gracefully tapering to a point; spores 4–7 x 2–3 µm.|
|6.||Stinkhorn narrowing substantially toward a somewhat pointy tip that is often pale and often becomes perforated; "spore slime zone" covering one-half to two-thirds of the stinkhorn; surface dark red underneath the spore slime; tropical in distribution.|
|6.||Stinkhorn not as pointy as above, not usually becoming perforated at the tip; "sSpore slime zone" covering one-fourth to one-third of the stinkhorn; surface color varying; variously distributed.|
|7.||Mature stem white (all the way to the apex, under the slime); originally described from Oregon, recorded from Michigan (range undetermined).|
|7.||Mature stem dark rose pink above, rose pink to whitish below; rather stocky; stem surface with large pits; common in northeastern North America.|
|8.||Mature stinkhorn with a netted "skirt" (reminiscent of a doily on your grandmother's coffee table) hanging from the cap.|
|8.||Mature stinkhorn lacking a "skirt."|
|9.||Skirt 3–6 cm long, not extending to the ground, with fairly small holes and thick dissepiments; fairly common in the Midwest and eastern North America.|
|9.||Skirt longer than above, often extending nearly to the ground—and more graceful, with large holes and narrower dissepiments; likely to occur only in tropical and subtropical locations or in greenhouses.|
|10.||Fresh, mature stinkhorn with a red, pink, or orange stem.|
|10.||Fresh, mature stinkhorn with a whitish stem.|
|11.||Stem red to pink, up to 2.5 cm thick; distributed from the southeastern states to Texas, Oklahoma, and Colorado.|
|11.||Stem orange, under 2 cm thick; fairly widely distributed in the United States but most common in the Midwest and Mid-Atlantic states.|
|12.||Cap smooth or finely granular beneath the spore slime; found east of the Rocky Mountains.|
|12.||Cap pitted and ridged beneath the spore slime; eastern or western in distribution.|
|13.||With a more or less central, single (not composite) stem that is clearly visible above the volva for at least a few centimeters; the stem may then split into columns or tentacles (which may or may not rejoin at the very top), or it may support a latticed structure.|
|13.||Central stem if present composite, composed of multiple arms fused together--or stem absent or rudimentary, not extending more than a centimeter above the volva.|
|14.||Stem more or less round in cross-section.|
|15.||Stem holding aloft a pointed structure that lacks prominent cross-lattices--or stem branching into vertical arms, appearing like claws or tentacles, that may fold back by maturity.|
|16.||Stem holding aloft a pointed structure with 4-6 short columns (under 4 cm long) that are firmly fused at their tips at first but may separate slightly at maturity.|
|16.||Stem terminating with 3-22 long arms (longer than 4 cm) that may or may not be joined at their tips initially, but by maturity may be separated and spread out like octopus or squid tentacles.|
|17.||Claws covered with spore slime all the way to their bases, almost always separating and folding back somewhat by maturity; reported from Ohio and Kansas, and to be expected throughout subtropical and tropical North America.|
|17.||Claws covered with spore slime except at their bases, rarely separating or folding back at maturity; reported from Asia and Africa.|
|18.||Arms or tentacles thin, numbering 5-22, never connected at the top; spore slime covering the disc between the tentacles, or the bases of the tentacles (or both), but not extending to their tips.|
|18.||Arms or tentacles fairly thick, numbering 3-7, initially connected at the top; spore slime covering inner/upper surfaces of arms, all the way to their tips.|
|19.||Arms numbering 4-7, usually separating and peeling back almost to the ground by maturity; documented from California; spores 4-7.5 x 2-2.5 µ.|
|19.||Arms numbering 3-4, usually remaining fused at their tips or peeling back only slightly by maturity; documented from northeastern North America and Kansas, to be expected across the continent; spores 3.5-4.5 x 1.5-2 µ.|
|20.||Stinkhorn consisting of a cage-like structure, with horizontal cross-lattices (at least near the top of the structure) in addition to vertical lattices.|
|20.||Stinkhorn without horizontal cross-lattices, consisting only of vertical columns which may or may not be fused at their tips--and which may or may not peel back at maturity to appear like the arms of an octopus or squid.|
|21.||Cross-lattices numerous, but only occurring at the top of the stinkhorn, held aloft by 4-6 vertical columns which are often fused together into a stemlike structure; reported from Jamaica.|
|21.||Cross-lattices not restricted to the top of the stinkhorn; variously distributed.|
|22.||Cross-lattices rare, only occasionally occurring between 2-5 thick, vertical columns that are fused at their tips.|
|22.||Cross-lattices frequent, creating a cage-like appearance.|
|23.||Growing in Florida and along the Gulf Coast; holes in the cage surrounded by "coronas" (see the photos on the page linked to the right); spores about 4 µ long.|
|23.||Growing on the West Coast, or in Mexico, or in the Caribbean; holes lacking coronas; spores 4-6 µ long.|
|24.||Stinkhorn a red to orangish cage-like structure; growing in California (especially in the Bay Area) and Mexico.|
|24.||Stinkhorn a bright yellow cage-like structure; documented in Cuba and Jamaica.|
|25.||Spore slime borne only on a structure (a "glebifer") that hangs at the top of the stinkhorn, under the arches formed by vertical columns which are fused at their tips.|
|25.||Spore slime not limited to an apical glebifer.|
|26.||Columns not crested.|
|27.||Columns white to pale beige when fresh; documented from Texas and Mexico.|
|27.||Columns not white to pale beige when fresh; variously distributed.|
|28.||Columns whitish to pale beige; outer sides with grooves; known from Mexico.|
|28.||Columns white; outer sides without grooves; known from Texas, the Caribbean, Africa, and South America.|
|29.||Spore slime confined to the upper portion of the interior surfaces of the columns (rarely lower than the top half).|
|29.||Spore slime covering the entire interior surfaces of the columns, from top to bottom.|
|30.||Stinkhorn with 2-5 columns up to 15 cm tall; reddish to orangish; occasionally with a cross-lattice or two; distributed from New York to the Gulf States, Illinois, and Mexico; especially common in Florida.|
|30.||Stinkhorn with 2 columns up to 9 cm tall; orangish or yellowish; without cross-lattices; recorded from California.|
|31.||Arms numbering 4-7, usually separating and peeling back almost to the ground by maturity; documented from California.|
|31.||Arms numbering 3-6, remaining fused at their tips or peeling back only slightly by maturity; variously distributed.|
|32.||Arms numbering 3-6; outer surfaces grooved; edges of arms appearing toothed; known from Mexico and the Caribbean southward.|
|32.||Arms numbering 3-4; outer surfaces not grooved; edges of arms not appearing toothed; documented from northeastern North America to Kansas, to be expected across the continent.|
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Cite this page as:
Kuo, M. (2011, April). Stinkhorns: Phallaceae and Clathraceae. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/phallaceae.html