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When: 2019-05-29

Collection location: Miradero, Mayagüez, Puerto Rico, USA [Click for map]

Who: kurt miller (komille277)

No specimen available

Notes:
Extremely common, metropolitan (in Puerto Rico) graminicolous fungus.

Species Lists

Images

Spores @ 1000x

Proposed Names

-29% (1)
Recognized by sight: Stipe short, excentric in illustration. Has few gills (“three or four, with short intermediates”)! Type from Sri Lanka
Used references: Transactions of the British Mycological Society 31 (1-2), 1947, p. 43; Transactions of the British Mycological Society 34, 1951. p. 422 Fig. 3
29% (1)
Used references: Sydowia 9(1-6): 386 (1955)
-29% (1)
Recognized by sight: A central american variety, but this taxon would have 6-8 lamellae
“including partially formed ones”
Used references: Mycologia 80(3): 286 (1988)
29% (1)
Recognized by sight: Dennis: “Marasmius pruinosulus Murril is superficially similar (to M. paspali) but has a gelatinous trama and lacks the brown cystidia on the pileus”; Type collected on dead grass stems in Cuba
Used references: Transactions of the British Mycological Society 34, 1951. p. 426; N. Amer. Fl. (New York) 9(4): 258 (1915)
29% (1)
Recognized by sight: On dead Bermuda grass from Cuba
Used references: North American Flora 9 (4) (1915) page 259
57% (1)
Recognized by sight: Type from Cuba (Marasmius graminis)
Used references: Pegler, D.N. (1988). A revision of the Agaricales of Cuba 3. Keys to families, genera and species. Kew Bulletin 43 (1): p. 60

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Comments

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From
By: kurt miller (komille277)
2020-05-27 05:18:54 MST (-0700)

Pierre-Arthur Moreau (in Tropical Fungi fb group)

“I was looking for a name myself for this species which is common in lawns in the French Caribbean. I got an ITS sequence from it, which clusters close to M. paspali (but not identical) in the Tetrapyrgos/Campanella clade. The microscopy is that of a Marasmiellus sect. Tricolores also conform to M. paspali, but I could not find a good match in Pegler’s Agaric flora of the Lesser Antilles (1983) and did not look further so far.”

Indeed M. paspali is not listed in Pegler, and the only taxon that might share this habit and ecology in this reference is M. graminum which is collariate and thus easily distringuished. Using Dennis’ Fungus flora of Venezuela one would key this out as M. paspali (from Trinidad) based on ecology, but both his collections and the type (from Sri Lanka) have short, excentric stipes. The caribbean collections have relatively long, central stipes and are easily mistaken for Tetrapyrgos, at least based on the color of the carpophores. In any case, as mentioned by Moreau, this may be close but not identical to other M. paspali sequences and I am not sure of the geography of the taxa that have been sequenced.

One glaring difference of all the descriptions of M. paspali collections from other parts of the world are the very sparse number of lamellae (3-8) vs. Puerto Rican and French Caribbean specimens which have around 20 or more. Dennis’ illustration of Trinidadian material from Transactions of the British Mycological Society 34 has at least 12 gills.

Marasmiellus tricolor var. graminis is a possible ID, it should be easily distinguished from M. paspali and all its varieties by the presence cheilocystidia in the former (see discussion in Mycologia 80(3): 286 (1988))