THE OREGON BLACK TRUFFLE, LEUCANGIUM Frequently Encountered False Truffles As Well
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BULLETIN OF THE PUGET SOUND MYCOLOGICAL SOCIETY Number 452 May 2009 THE OREGON BLACK TRUFFLE, LEUCANGIUM frequently encountered false truffles as well. “Truffle,” as used CARTHUSIANUM: A Fascinating and Fragrant by the above authors, simply refers to hypogeous (subterranean) Find from a Local Backyard Brian Luther fungal fruiting bodies, regardless of the taxonomic grouping, a convenient catchall category. In early April Hildegard Hendrickson came over and dropped off The Europeans tend to be very narrow in their interpretation of half of a truffle-like fungus with a note asking for an identifica- a true truffle—fungi in the genus Tuber or in the family Tubera- tion. It was found and collected by PSMS member Doug U-Ren ceae of the Ascomycetes (Ascomycota). These fungi have unique (Young Doug) on April 7 with wood chips and soil in his backyard spores that set them apart from the other truffle-like fungi. Thus in Edmonds. The only trees in the area were Douglas Fir about other hypogeous fungi, both Ascomycetes and Basidiomycetes 35 feet away. and others not possessing these characters and not placed within It was a good-sized specimen that was in very good, fresh con- the Tuberaceae, are considered as “false truffles,” if you follow dition. It had a dark brown, almost black, and very roughened this line of thinking. peridium, and in cross section the gleba was beautifully marbled Others take a more liberal or broad-minded approach, including with dark chambers surrounded by pale, whitish veins. It had a all developmentally subterranean or even mostly subterranean pronounced, fragrant smell that was, as I describe it, a very power- fungal fruiting bodies as truffles. ful truffleoid odor—that is, fragrant but a bit musty too. Peculiar enough that I couldn’t nail down any comparative odor for refer- As an undergraduate in the Dept. of Botany at the University of ence. The odor was so strong that it filled my mycology lab and Washington in the early 1970s, while taking Dan Stuntz’s Asco- library and was very noticeable to others entering. My wife Pam mycete course, I clearly remember having a conversation with thought the odor was disagreeable. I didn’t find it objectionable, Dan about exactly what a true truffle was. His view was that of just really strong. The inside of the gleba briefly reminded me of the traditional Europeans and Helen Gilkey’s—namely it had to be the Basidiomycete false-truffle genusMelanogaster because of the in the Order Tuberales to be a true truffle. Following this reason- dark fertile chambers surrounded by whitish veins, but it lacked ing, the Oregon Black Truffle is also a “false truffle”; although it the gelatinous texture of that genus. The only species of that genus is an Ascomycete, it’s placed in the family Discinaceae, not the that I’ve studied in detail is Melanogaster tuberiformis, which Tuberaceae. In Europe this species is called the “Summer Truffle” is very different in size, form, and appearance (inside and out) to distinguish it from species of the genus Tuber. and has a distinctive garlicky odor which this collection lacked. Most of the hypogeous truffle-like fungi that have been brought or Miller (1997) states that species in the genus Melanogaster have sent to me for ID over the years have turned out to be some kind a “strong odor of latex paint.” of false truffle, and most of these have ended up being species in I pondered what it could be macroscopically only very briefly the genus Rhizopogon. It is worth noting that truffle-like fungi before taking it into the lab and doing a microscopic examina- have evolved in many groups of fungi. Some are Basidiomycetes, tion. It turned out to be an Ascomycete “truffle” in the family closely related to boletes, coral fungi, agarics (gilled mushrooms), Discinaceae—Leucangium carthusianum (Picoa carthusiana in stinkhorns, or other Gastromycetes. Still others are Ascomycetes, Gilkey, 1954; Arora, 1979; Castellano et al., 1989; and Phillips, closely related to morels, helvellas, other Discomycetes and other 1991), with only a difference in glebal color. This is the highly major fungal taxonomic groups as well, such as Zygomycetes, prized Oregon Black Truffle. Glomeromycota, etc. Regardless of your personal interpretation of what a “truffle” is, the specific macroscopic and in particular microscopic features of these fungi are what define their precise taxonomic position within the Kingdom of Fungi. The Oregon Black Truffle belongs to a family of Discomycetes that are very familiar to most of you in spring, the Discinaceae. The genera Discina, Gyromitra, and Pseudorhizina, in particular, are represented by several frequently encountered and conspicuous species in our spring flora and are common “snow bank” fungi, often being found near receding snow. It’s interesting to note that all of our terrestrial above-ground fruiting species in this family Oregon Black Truffle, Leucangium carthusianum. do not have any noticeable odor. An excellent recent publication, Field Guide To North American It’s then curious to think about the evolutionary significance of Truffles, by Trappe et al. (2007) covers true truffles, but by far strong odors that have formed in their subterranean relatives it mostly treats false truffles. Of the 90 species illustrated and such as the Oregon Black Truffle. It seems quite logical that the described in this handy little book, only 10 are true truffles in the Tuberaceae, making it a great reference for the diverse and more cont. on page 4 page 1 MEMBERSHIP MEETING Tuesday, May 12, 2009, at the Center for Urban Horticulture, 3501 Spore Prints NE 41st Street, Seattle is published monthly, September through June by the Our May meeting will feature Susan Kaufman, PUGET SOUND MYCOLOGICAL SOCIETY owner of Serafina, and Serafina’s executive chef, Center for Urban Horticulture, Box 354115 Dylan Giordan. Taste, smell, and admire the University of Washington, Seattle, Washington 98195 (206) 522-6031 http://www.psms.org mushrooms prepared by Susan and Dylan and User name: Password: learn some techniques that they will share with our mushroom community. Serafina is located in OFFICERS: Patrice Benson, President the Eastlake neighborhood and serves fabulous Susan Kaufman Milton Tam, Vice President Italian-style dishes prepared with the freshest ingredients. Susan John Goldman, Treasurer Denise Banaszewski, Secretary Kaufman is a member of Les Dames d’Escoffier which provides opportunities and scholarships to women in Washington State to TRUSTEES: Brenda Fong, Debra Lehrberger, study culinary arts and arts of the table. Cathy Lennebacker, Don Lennebacker, Dennis Notman, Jamie Notman, Please come a little early to browse the book section or visit our Randy Richardson, Jennifer Slack, library. Will those with last names beginning with the letters A–K Kim Traverse, Jean Zatochill please bring a treat to share. Ron Post (Immed. Past Pres.) ALTERNATE: Louise Asif, Jim Hughes SCI. ADVISOR: Dr. Joseph F. Ammirati CARNATION FIELD TRIP Hildegard Hendrickson EDITOR: Agnes A. Sieger, 271 Harmony Lane, & Brian Luther Port Angeles, WA 98362 [email protected] The morning of Saturday, March 28, was as cold and rainy as many mornings this spring. Annual dues $25; full-time students $15 We had scouted the area Thursday, and knew that we could not expect many mushrooms. Even though fungi were few and far between on our scouting trip, we came across a farm field near CALENDAR Carnation with an unusual breed of dairy cattle with distinctive markings. Brian recognized them right away as Dutch Belteds. May 9 Field Trip, 29 Pines Hildegard pulled off the road so Brian could get some good May 11 Master Gardeners’ ID clinic, 4–7 p.m., CUH atrium photos. You rarely see this breed, but it’s highly regarded for its milk production. May 12 Membership Meeting, 7:30 p.m., CUH On Saturday, on the way to the field trip, Brian and Hildegard May 16 Field Trip, Swauk Creek had a “jolt” while driving up Tolt Hill: a deer jumped in front of May 18 Board Meeting, 7:30 p.m., CUH Hildegard’s car and tested her brakes. The car did not miss the Master Gardeners’ ID clinic, 4–7 p.m., CUH atrium deer by more than an inch. Both we and the doe (and the car) were May 19 Spore Prints deadline lucky the encounter wasn’t any closer. May 22–25 Field Trip, Eagle Creek We had seen on Thursday how the December/January flood had May 25 Master Gardeners’ ID clinic, 4–7 p.m., CUH atrium devastated MacDonald Park. The park had not officially opened because the toilets were not operational (there were several “hon- May 29–31 Ben Woo Foray cancelled eybuckets” available), and the electricity had been restored only the day before. The park ranger allowed us to use the red barn, which we all welcomed, so we did not have to carry all the sup- BOARD NEWS Denise Banaszewski plies and books across the hanging foot bridge. We had coffee and munchies and Hildegard brought some delicious, rich fruit cake The good news is that Mushroom Maynia! is coming up quickly, for the 45 persons who came. After we gave short lectures, the and we’re hoping to have a great turnout and a great time again group divided and we took off into the woods. this year. The sad news is that the Ben Woo Memorial Foray The unusually cold March delayed everything, and only a handful will be canceled this year. Mushroom ID clinics will continue on of species of fungi were collected, even with two groups going Mondays from 4:00–7:00 p.m. at the CUH in conjunction with out in different locations.