Observation 48809: Rhizopogon Fr. & Nordholm

When: 2010-07-02

Collection location: Little Hartley, New South Wales, Australia [Click for map]

Who: Lucy (lucya)

No specimen available

Found next to #48733. Same type but older?

[admin – Sat Aug 14 01:58:42 +0000 2010]: Changed location name from ‘Blue Mountains, NSW, Australia’ to ‘Blue Mountains, New South Wales, Australia’

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When eucalypts are nearby
By: Daniel B. Wheeler (Tuberale)
2010-07-21 08:09:54 AST (-0400)

then must also consider Hydnangium, which is often found near eucalyptus. In the U.S., Hydnangium carneum has been found in California and Oregon, apparently introduced from live eucalyptus introduced from Australia a century ago. Hydnangium differs from Rhizopogon by having a felty peridium (outside). If you look at the peridium under a magnifying glass, the peridium should look like it is composed of lots of small hairs woven together. Rhizopogon has a paper thin peridium made of multiple tissue-paper-like layers. Hydnangium carneum has a mostly pinkish to pinkish-brown gleba when mature. In the U.S. known from November thru May; in Australia it fruits from July thru November. Edibility of most mycorrhiza associated with Eucalypts is unknown. Hydnangium carneum is known to be edible, but is said to be nearly odorless and “insipid” in “Field Guide to North American Truffles.” If the peridium is felty, Hydnangium carneum is a good match, I think.

Dr. Teresa Label is one of the Australian experts in truffle-like fungi, but I don’t have her contact information. While pine is a very common host of truffle-like fungi, eucalyptus has just as many if not more, including a plethora of fungi not found in the United States.

Eucalyptus close by
By: Lucy (lucya)
2010-07-21 05:32:37 AST (-0400)

Yes, you are correct – eucalyptus trees are less than 10m away from the where I found these. As for the pine trees, I’m not sure what type they are but I can find out. Sorry I know so little – I stumbled across a mushroom a month ago while visiting my mother in the Blue Mountains and have been fascinated by all things mushroom ever since (but these remain my particular love!). Perhaps these are a new type – an Australian mountain Rhizopogon?!

Does appear to be older.
By: Daniel B. Wheeler (Tuberale)
2010-07-20 11:52:47 AST (-0400)

The darker the gleba (interior), the more likely it has mature spores present. Rhizopogons can mature almost overnight in dry conditions, though.

The peridium (outside) looks odd to me, like a plated puffball, with less rhizomorphs than I’m used to seeing. Also, most Rhizopogons I’ve collected are at least partially buried and therefore protected from dessication. The gleba suggests this is Rhizopogon or a close relative. You state it was found near pine, but there appear to be eucalyptus or willow leaves in the photo as well. Rhizopogon may fruit 300 feet away from a host tree 100 feet tall, so the host doesn’t have to be exactly nearby, although the nearest host tree is most likely. I don’t see any bruising of the peridium, which is very common among Rhizopogon.

Created: 2010-07-20 07:01:17 AST (-0400)
Last modified: 2010-08-17 06:48:46 AST (-0400)
Viewed: 319 times, last viewed: 2018-12-25 19:39:21 AST (-0400)
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