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hiidkogrits

Page history last edited by PBworks 17 years, 5 months ago

hiidkogrits(Gyromitra gigas)

Kevadine kogritsaliik on hiidkogrits (Gyromitra gigas), kes on heleda pruunikas-ookerja kübaraga ja kasvab lubjarikka mullaga segametsades okaspuukändude läheduses. Ta sisaldab samu mürkaineid mis kevadkogritski, kuid vähemal määral ja teda ei peeta nii ohtlikuks mürkseeneks kui kevadkogritsat.

Gyromitra korfii (Gyromitra gigas)

by Michael Kuo

Gyromitra gigas, found in many field guides, is recognized by its massive stem and its squarish, tightly adherent cap. Some mycologists split Gyromitra gigas into two species, Gyromitra korfii (described below) and Gyromitra montana. Gyromitra korfii has a stout, massive stem, and a tan to golden brown or brown cap. It is extremely difficult to distinguish from Gyromitra montana on the basis of field characteristics--although the two mushrooms do apparently grow in different places. Gyromitra korfii appears to be limited to territory east of the Rockies, while Gyromitra montana is apparently found in the Rockies and westward. According to some authors, the mushrooms can be separated on the basis of spore characteristics: The spores of Gyromitra korfii have blunt, knob-like ends when mature, while the spores of Gyromitra montana have smaller, less conspicuous projections.

Despite the fact that it is consumed by many, this mushroom is not a safe edible! See the page on False Morel Toxicity for further information.

Description:

Ecology: Officially saprobic, but potentially also mycorrhizal--or, like the true morels, donning both ecological hats in the course of its life cycle; found under hardwoods in spring; east of the Rocky Mountains. I once found Gyromitra korfii growing out of the side of a dead Big-Toothed Aspen, five feet above the ground!

Cap: 5-10 cm; variable in shape but often squarish; tightly affixed; wrinkled to convoluted; tan to brown, rarely cinnamon or tawny; underside paler, ingrown with stem where contact occurs.

Flesh: Whitish; brittle.

Stem: 3-6 cm; pale tan to white; massive; smooth; with ribs or waves.

Microscopic Features: Spores 25-30 x 10.8-12.6 µ; spindle-shaped, with a knob at each end. The broad, blunt apiculi appear to develop with maturity, and are often absent on immature spores.

Harmaja, 1973. (Harmaja, 1973; Weber, 1995; Abbott & Currah, 1997; Kuo, 2005.) Herb. Kuo 05170201, FMP 05259503, 04240302.

Officially, Gyromitra gigas is the correct current name for this species, since Abbott & Currah (1997) synonymized Gyromitra korfii and Gyromitra montana with Gyromitra gigas, and a more recent (officially sanctioned) treatment does not exist. Abbott & Currah examined the spores of a gazillion putative Gyromitra montana specimens from the northern Rocky Mountains, together with spores of a North Carolina type collection of Gyromitra korfii and spores of three Scandinavian collections labelled Gyromitra gigas. The authors found that sporal "features overlap," and that "these taxa should be accepted as conspecific with a rather broad range of ascospore morphology" (23). Since Gyromitra gigas is the oldest species name among the three, it wins, according to the rules that govern botanical names. A DNA study of this species group has not been published.**