Name: Leptonia (Fr.) P. Kumm.
Most Confident Observations:
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Copyright © 2010 Dave W (Dave W)
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Copyright © 2008 Ryane Snow (snowman)
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Copyright © 2009 Dan Molter (shroomydan)
Version: 13
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Nomenclature:

Rank: Genus

Status: Deprecated

Name: Leptonia

Author: (Fr.) P. Kumm.

Citation:

Preferred Synonyms: Entoloma subgenus Leptonia (Fr. : Fr.) Noordel., Entoloma sect. Leptonia (Fr.: Fr.) Noordel.

Classification:
Brief Description:

Basidiocarps usually collybioid or mycenoid, more rarely tricholomatoid or omphalinoid.

Section Cyanula often with steel grey to blue to midnight blue or blue-black pigments.

Section Leptonia often with browner or yellow-brown coloration, but also with bluish pigments in some members.

Other taxa have rosy, pink, or pale coloration.

Pileus dry, densely tomentulose at the disc and outwards squamulose to appressed squamulose or apressed-scaly with a glabrous at the margin in Section Cyanula.
Smooth or most often radially fibrillose to scaly to apressed squamulose in Section Leptonia. Margin sometimes striate (taxonomically important) or translucent striate. Pigmentation may change dramatically from youth to maturity.

Lamellae thin, close to more well spaced, sometimes venose, usually adnate, sometimes adnexed or seceding, rarely decurrent. Pale, sometimes with a bluish cast, sometimes aging yellowish (taxonomically important), sometimes with an uneven margin, sometimes with a darkened margin (very taxonomically significant).

Stipe grey, bluish, tan to yellow-brown to pallid (taxonomically important). Smooth to scaly or densley fibrillose (taxonomically important), hollow, sometimes with a prominent boot of mycelial tomentum, staining reactions of this mycelium may be taxonomically important.

Macrochemical reactions obscure and rarely taxonomically important.

Pileipellis often a trichodermium at the disc and a cutis with transitions to a trichoderm outwards, also often a palisade-trichoderm (hymeniderm). In Section Leptonia either with clamps or with elements (sometimes rounded) in distinct chains (ie. submoniliform or a calliderm). Usually discoloring to wine brown or red-brown in KOH, diagnostically remaining blue in Leptonia carnea. Usually with intracellular pigmentation, sometimes encrusted (should be viewed in a saturated sugar or salt solution).

Lamellar trama subparallel, with reflective granules.

Basidia typically clavate and 4-spored, sometimes 2-spored (important), not often of great taxonomic importance.

Spores distinctly 5-7 angular with prominent hilar appendage, usually heterodiametric (high Q value). Length taxonomically important (> or < 10 microns).

Pleurocystidia usually absent.

Cheilocystidia sometimes present, sometimes pigmented, of taxonomic importance, tibiiform to capitate in Section Rhamphocystotae.

Caulocystidia often present as clavate to irregularly cylindrical or flexuous hyphae.

Presence/absence of clamps of taxonomic importance.

Descriptions: [Create]

Comments

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Follow the local literature
By: Oluna & Adolf Ceska (aceska@telus.net)
2017-04-11 22:44:40 CDT (-0400)

In Leptonia, Nolanea, etc. we follow the taxonomy and nomenclature as it was published by David Largent in his Pacific Northwest monograph of entomoloid fungi. We will try to do the same in polypores where Jim Ginns published the British Columbia Polypores just recently. If you have that in mind, you can understand our MO observation names, providing that you are mycologically literate.

specialists in Entolomataceae
By: Danny Newman (myxomop)
2015-03-15 23:17:08 CDT (-0400)

still describing new species and recombining old ones to live inside the house of Leptonia. See “Leptonia (Entolomataceae, Agaricales) da região metropolitana de São Paulo” on pg. 99 of this thesis

Deprecated
By: Jacob Kalichman (Pulk)
2014-05-22 02:03:12 CDT (-0400)
Interesting article
By: Nathan Wilson (nathan)
2011-12-19 21:06:29 CST (-0500)

It does suggest that Leptonia as traditionally circumscribed is not a good genus. However, I noted that the type for Leptonia, Leptonia euchroa, was not included in the analysis so it isn’t clear to me at least Leptonia won’t one day be resurrected in some new form.

Thanks for providing the link to the article. This makes for a much more compelling argument than just saying "I heard there’s some molecular evidence for ".

Dan: because of this:
By: Christian (Christian Schwarz)
2010-07-30 14:45:53 CDT (-0400)

Co-David, DLV, Langeveld, D. & Noordeloos, ME. 2009. Molecular phylogeny and spore evolution of Entolomataceae. Persoonia 23: 147-176.

There is a freely available version here:
http://www.entoloma.nl/html/tasmania_downloads.html

The gist is that Leptonia is nested within Entoloma and not in a coherent way, either. It is a ¨bad genus¨

Why is Leptonia depricated?
By: Dan Molter (shroomydan)
2010-07-30 14:16:02 CDT (-0400)

?

Created: 2007-01-10 00:05:35 CST (-0500) by Nathan Wilson (nathan)
Last modified: 2017-07-21 21:17:55 CDT (-0400) by Jacob Kalichman (Pulk)
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