Agaricus comptulus

About this Item

Name

Scientific Name: Agaricus comptulus
Genus: Agaricus
Species: comptulus

Description

Scale: nat. size
Herbarium Number: 1936

Collection Event Data

Collection Location: Cambridge, Mass. On Prof. Kellner's lawn, Phillips Place and Berkeley St. Under pine trees, in sparse shade-grass. (Poa trivialis)
Collection Date: September 9, 1907

Notes

Notes Alert: (Includes notes pages--See other views)
Notes: [Spores] 3.5-4 x 6-6.4 microns; Pileus 2.3-5 cm. broad, whitish, changed to bright Indian Yellow when touched, clothed with dull-reddish-brown exceedingly find loosely scattered appressed hairs (squamulosely hairy, not virgate) that are denser on the flattened or slightly depressed disk; flesh rather thin, not quite 4 mm. in center, thinning out toward the margin, persistently white, only a very faint trace of yellow developing in the base of the stem. Gills close, irregularly unequal, free, broader anteriorly than posteriorly, about 4.5 mm. at broadest part, of a beautiful light-grayish-pink at first, changing to a light-grayish-chocolate color, staining white paper a deep Indigo Blue (as Atkinson notes). Stem 3.5 to 4 cm. long, about 5 mm. thick above, thickening to 7-8 mm. at the base, gracefully curved, finely hollow, but stuffed with a soft silky pith; surface, below the ring, covered with very fine soft fibrils that turn to bright Indian Yellow when touched, above the ring, shining and silky-fibrous. Veil extremely thin and delicate, median, pendulous, about 4 mm. long, remains of it attached to the margin of the pileus. Spores 6-6.4 x 3.5-4 microns.; The large specimen figured was the largest found. Apparently this species grows no larger. Lloyd says that the diameter of the pileus never exceeds 5 cm.; The egg-yellow color, at first appearing only where the plants are touched, soon extends over the entire surface of pileus and stem.; A pronounced, but evanescent, amygdaline odor was noticed in freshly broken plants.
Creator: Louis C. C. Krieger
General Information: The content of these records were transcribed from the original handwritten information, and although every attempt was made to do so accurately, we cannot guarantee the accuracy of the transcription or the accuracy of the original information.; Common names were obtained from the following sources:; Miller, Orson K. and David F. Farr. An index of the common fungi of North America, synonymy and common names. Vaduz [Liechtenstein]: J. Cramer, 1975. 206 p.; Lincoff, Gary. The National Audubon Society field guide to North American mushrooms. New York: Knopf: Distributed by Random House, c1998. 926 p.; Smith, Alexander H. The mushroom hunter's field guide. Ann Arbor: Univ. of Michigan Press, c1980. 316 p.

Technical Details

Collection: University of Michigan Herbarium, Krieger's Watercolors of Fungi
Image Size: 3446 x 3618
File Size: 618 KB
Record: 148
Link to this Item: https://quod.lib.umich.edu/f/fuwatic/x-148/w32

Rights and Permissions

The University of Michigan Library provides access to these materials for educational and research purposes. We believe these materials to be in the public domain. If you have questions about the collection, please contact the Herbarium Fungus Collection staff. If you have concerns about the inclusion of an item in this collection, please contact Library Information Technology.

NO COPYRIGHT - UNITED STATES The organization that has made the Item available believes that the Item is in the Public Domain under the laws of the United States, but a determination was not made as to its copyright status under the copyright laws of other countries. The Item may not be in the Public Domain under the laws of other countries. Please refer to the organization that has made the Item available for more information.

IIIF

Manifest: https://quod.lib.umich.edu/cgi/i/image/api/manifest/fuwatic:148:W32

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Full citation: "Agaricus comptulus." In the digital collection University of Michigan Herbarium, Krieger's Watercolors of Fungi. https://quod.lib.umich.edu/f/fuwatic/x-148/w32. University of Michigan Library Digital Collections. Accessed April 23, 2024.