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Inocybe lanuginosa
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Inocybe lanuginosa

Common Name: Wooly Fiber Head

Synonyms: 

Substrate: Ground

Location: Hardwood Forests

Spore Color: Brown

Gill Color: Brown

Comments: 

Like many Inocybe, small, brown, and terrestrial. It is usually impossible to get Inocybe down to species without a microscope, so don't spend too long with the species unless you have one. This is a good name for any small, brown Inocybes that have scales on the cap and a fairly smooth stem that does not bruise. It is an even better name if you can measure the spore size and witness nodules on the spores. 

This species has a cap with a dimple, and small hairs emanating from the center. It is said that this mushroom can also be found on very well rotted wood, as well as terrestrially. Should have brown gills, brown spores, and a mild odor.  Abundant cystidia under the scope. Spores have many nodules and are smaller than many other species in the genus (6.5 - 10 microns long). This ID obtained using North American Mushrooms (Miller) and Audobon Guide (Lincoff).

Poisonous.

Lookalikes:  

Very similar to Inocybe hystrix which has a scaly cap and stem, with smooth, eliptical spores (9-13 microns long). The hairs on I. hystrix should be similar to those on puffballs. Inocybe lacera is also very similar but has much larger, cylindric spores without nodules (12-17 microns long). It often has a splitting cap. Inocybe calamistrata has a stalk base that bruises bluish green. Inocybe calospora has spores that have long spines. Inocybe leptophylla is found under conifers, has no cystidia, and larger spores (9-12 microns). 

Pictures:

 

Inocybe lanuginosa

Inocybe lanuginosa

 

Spores and cystidia

5/14/12 - Griffy Reservoir - Bloomington, IN

Inocybe lanuginosa

Inocybe lanuginosa

 

A small brown Inocybe growing under a Beech tree in the moss.  Not really a distinctive smell. Spores have nodules, roughly 8x6.

Keys out to Inocybe umboninota from a 1903 paper, but I do not have Pecks original description for a comparison.

Small brown fuzzy Inocybes with spores under 10 microns will be called Inocybe lanuginosa group.

4/20/12 - Fairfax SRA - Monroe Co. IN