Public Description of Irpex lacteus (Fr.) Fr.

Title: Public Description (Default)
Name: Irpex lacteus (Fr.) Fr.
View: public
Edit: public
Version: 3
Previous Version 

Descriptions: Create
 Public Description (Default) [Edit]
 Draft For 2008/2009 Eol University Species Pages Initiative By Dan Anderson (Private)

Description status: Approved
 (Latest review: 2010-04-11 06:18:45 PDT (-0700) by nathan)

Taxonomic Classification:

Domain: Eukarya
Kingdom: Fungi
Phylum: Basidiomycota
Class: Agaricomycetes
Order: Polyporales
Family: Meruliaceae


General Description:

Irpex lacteus is in the phylum Basidiomycota, class Hymenomycetes, order Aphyllorphorales, family Polyporaceae and genus Irpex. Common name is “Milk-white Toothed Polypore.” Fruiting body is effused-reflexed growing on the underside of fallen hardwoods. Fruiting body appears to be similar in color to milk, but may range from white, to off-white or cream colored. Pores that break up into short teeth (less than 3 mm long) when mature. Fruiting body is dry and stiff (Bessette et al.).

Pictures:

<img src=“http://www.messiah.edu/...; alt=“\”\"" />

Picture of Irpex lacteus from messiah.edu



Photo by William Tannenberger


Diagnostic Description:

Irpex lacteus is the only species in the genus Irpex. To identify the genus; if the teeth are less than 3 mm in length (Irpex), if teeth are longer than 3 mm in length when mature you may have Spongipellis pachyodon. Irpex is a saprophyte on hardwoods and infrequently conifers causing white rot, but maybe parasitic on Cherry trees. Spore print white with spores ranging from 5-7 × 2-3 um that are smooth, cylindrical and inamyloid (Bessette et al.).


Distribution:

Distributed across North America but very rare in the Southwest. Also known from Europe and elsewhere.


Habitat:

It is found on the underside of fallen hardwoods, rarely on conifers, where it is a white rot saprophyte. It may be parasitic on Cherry trees.


Look Alikes:

Essentially no look alikes because it is the only species in the genus Irpex and the two characteristics, effused-reflexed and teeth less than 3 mm, make this species very easy to identify. Spongipellis pachyodon is a toothed polypore that looks somewhat similar but the teeth are usually longer than 3 mm in length.


Picture by James V. Gallagher IV

Schizopora paradoxa may sometimes look similar, but it is more poroid, and its hyphae have clamp connections.


Uses:

Irpex lacteus is inedible and isn’t commonly used by people.

However, it is an important saprophye in nature, returning nutrients back to the ecosystem.


References:

Bessette, Alan E., Arleen R. Bessette and David W. Fischer. Mushrooms of Northeastern North America. Syracuse: Syracuse University Press, 1997.

Emberger, Gary. 2008. Irpex lacteus. Retrieved from messiah.edu Web site: http://www.messiah.edu/...

Kuo, M. (2007, April). Irpex lacteus. Retrieved from the MushroomExpert.Com Web site: http://www.mushroomexpert.com/irpex_lacteus.html


Notes:

This is the only species in this genus.

Dan Anderson, 11/16/2008, UW-La Crosse Mycology


Description authors: Tom Volk, Dan Anderson (Request Authorship Credit)
Description editor: Nathan Wilson


Created: 2008-12-25 17:02:02 PST (-0800) by Tom Volk (TomVolk)
Last modified: 2010-04-11 06:18:45 PDT (-0700) by Nathan Wilson (nathan)
Viewed: 1231 times, last viewed: 2019-01-15 19:19:09 PST (-0800)