Bolbitius titubans explained

Bolbitius titubans, also known as Bolbitius vitellinus, and commonly known as the sunny side up^[1] is a widespread species of mushroom found in America and Europe. It grows chiefly on dung or heavily fertilized soil, and sometimes on grass. It is nonpoisonous.^[2]

Description

The mushroom cap is between 1.5–7 cm,^[3] and grows from egg-shaped when young to broadly convex, finally ending up nearly flat.^[4] The cap's color starts yellow or bright yellow, and fades to whitish or greyish with age.^[5] The gills are free from the stem or narrowly attached to it, are fragile and soft, and fade from whitish or pale yellowish to rusty cinnamon with age.^[4] The stem is 3–12 cm tall and 2–6 mm wide, is whitish-yellow with a fine mealy powdering, and is very delicate.^[6] The spores are brown, elliptical, and smooth.

The mushroom's edibility is unknown but it is too small to be worthwhile.

A similar species is Bolbitius aleuriatus.

Notes and References

1. Book: Arora, David . Mushrooms demystified: a comprehensive guide to the fleshy fungi . 1986 . Ten Speed Press . 978-0-89815-169-5 . Second . Berkeley . 474–475.
2. Book: Miller Jr.. Orson K.. North American Mushrooms: A Field Guide to Edible and Inedible Fungi. Miller. Hope H.. FalconGuide. 2006. 978-0-7627-3109-1. Guilford, CN. 270. Orson K. Miller Jr..
3. Book: Davis. R. Michael. Field Guide to Mushrooms of Western North America. Sommer. Robert. Menge. John A.. University of California Press. 2012. 978-0-520-95360-4. Berkeley. 248. 797915861.
4. Web site: Bolbitius titubans . Kuo. Michael. February 2012. October 31, 2013.
5. Web site: California Fungi—Bolbitius titubans . October 31, 2013.
6. Web site: Rogers Mushrooms — Bolbitus vitellinus Mushroom. https://web.archive.org/web/20081205004609/http://www.rogersmushrooms.com/gallery/DisplayBlock~bid~5589~gid~~source~gallerydefault.asp. December 5, 2008. October 31, 2013.