Observation 153980: Pluteus Fr.

Bottle-green caps quite rugose when young. Fading to golden-olive brown. Stipe yellow.
Infrequent on tanoak. I have also seen this on the UCSC Campus.

Species Lists


Proposed Names

57% (1)
Recognized by sight: Pluteus cf. romellii
25% (1)
Recognized by sight
25% (1)
Recognized by sight

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= Observer’s choice
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The cystidia
By: Christian (Christian Schwarz)
2013-12-04 09:25:52 JST (+0900)

are relatively broad, with a short narrow peduncle.

By: Alfredo Justo (Fredo)
2013-12-03 03:59:31 JST (+0900)

It is true that microscopical differences between species of sect. Celluloderma tend to be subtle and often with some degree of overlap between species, but there are a couple of things that help:

spore shape: are the spores (sub) globose (Q = 1.00-1.15) or (broadly) ellipsoid (1.15-1.60)?

pleurocystidia: are the pleurocystidia relatively broad as in Pluteus romellii (see illustration:http://books.google.com/...) or are they relatively narrow and with a long peduncle as in P. phlebophorus and P. chryophlebius (http://books.google.com/...).

To really reach a conclusion here you need sequence data, but at least there is a good number of sequences of Cellulodermas in GenBank

Microscopy done
By: Christian (Christian Schwarz)
2013-12-03 03:19:00 JST (+0900)

but how useful is it? It’s in section Cellulodermi (big round celluloderm pileipellis cells with brownish intracellular pigment), spore size seems not to be all that variable in this section (correct me if I’m wrong), and hymenial cystidia are variably utriform. No clamps (which is to be expected for this section, right?).
Sequence when this project gets running…

Another green one
By: Noah Siegel (Noah)
2013-12-03 01:25:42 JST (+0900)

that Christian and I found http://mushroomobserver.org/61035

two possible names
By: Alfredo Justo (Fredo)
2013-12-02 22:54:11 JST (+0900)

There are two possible names for a North American Pluteus with greenish caps:

Pluteus californicus McClatchie was originally described from California and has a green cap that in time becomes more brown. According to Minnis & Sundberg (www.pnwfungi.org/pdf_files/manuscripts_volume_5/naf20101.pdf) it is only known from the original collection. These authors also mention that although Murrill and later authors attributed a yellow stipe to this taxon that is not clear from the original description.

Pluteus rugosidiscus Murrill described from Virginia has also greenish tones on the cap. Minnis & Sundberg put the species in synonymy with P. chrysophlebius but molecular data indicate that it is indeed a separate taxon.

So probably this collection belongs to one of these two species. With the current data we cannot rule out the possibility that P. californicus and P. rugosidiscus are actually one and the same.

Christian, are you sequencing these?

what Martin said…
By: Richard Kneal (bloodworm)
2013-12-02 11:09:52 JST (+0900)


By: Martin Livezey (MLivezey)
2013-12-02 11:03:06 JST (+0900)

Microscopy? Sequence?

Green Pluteus
By: Drew Parker (mycotrope)
2013-12-02 04:53:52 JST (+0900)

There is a rather obscure greenish species described by McClatchie from CA, that like romellii, is in section Cellulodermi. It’s description sounds more gray-green than this however.

Very strange…
By: Drew Parker (mycotrope)
2013-12-02 04:34:00 JST (+0900)

I’ve never seen romellii that are at all greenish. Would be interesting to see micro features.

By: Randy Longnecker (Randy L.)
2013-12-02 02:45:48 JST (+0900)