Tremella placynthiellae Diederich & W.R.Buck

• Region

  North America

• Country

  United States of America

• State/Province

  Missouri

• County/Municipio

  Wayne Co.

• Locality

  Sam A. Baker State Park, Mudlick Mountain, along road to fire tower

• Township, Range, Section

  T30N, R5E, Sec. 29

• Elevation

  Alt. 300 m. (984 ft.)

• Coordinates

  37.2575, -90.5231

• Location Notes

  [Map associated with specimen]

• Distribution

  Map all specimens of this taxon

Tremellomycetes - Tremellales
Class Tremellomycetes
Order Tremellales
by P. Diederich, A. M. Millanes & M. Wedin
Diederich, P., A. M. Millanes & M. Wedin. 2022. Class Tremellomycetes, order Tremellales. 1b: Diederich et al. (eds.), Flora of LichenicoUms Fungi,
Vol. 1, Basidiomycota. National Museum of Natural History, Luxembourg: 103-282.
The New York Botanical Garden
Cryptogams of Missouri, U.S.A.
Tremella
on Placynthiella icmalea (Ach.) Coppins & P. James
Wayne County: Sam A. Baker State Park, Mudlick
Mountain, along road to fire tower, 37¦15Æ27"N,
90¦31Æ23"W, T.30N., R.5E., sec. 29, ca. 300 m;
oak-hickory forest with rhyolite boulders.
15 October 2003
William R. Buck 45306
NEW YORK BOTANICAL GARDEN
02280405
det. Paul Diederich, Luxembourg ( @ ú .2022)
HOLOTYPE OF:
Tremella placynthiellae Diederich & W.R.Buck
See. Diederich, P., A.M. Millanes and M. Wedin. 2022. Class
Tremellomycetes, order Tremellales. Flora of Lichenicolous Fungi 1: 105-
282. [on p. 235]
Det. J.C. Lendemer, 2022
Tremella placynthiellae Diederich & W. R. Buck, sp. nov.
Diagnosis-. Characterized by the small, subspherical, pale brown,
waxy-gelatinous basidiomata on the thallus of Placynthiella
icmalea, 0.04-0.16 mm diam., the medium-sized basidi-
osporcs, 5-6.5 * 4.5-6.5 pm, and the particularly small,
longitudinally, obliquely or transversely 1-septate basidia,
6.5ù12(ù14) x 5.5-9 pm.
Etymology. From Placynthiella, the host lichen.
Type: USA, Missouri, Wayne Co., Sam A. Baker State Park,
Mudlick Mountains, along road to fire tower, 37¦15Æ27öN,
90¦3r23öW, 300 m, T.30N., R.5E., sec. 29, oak-hickory for-
est with rhyolite boulders, on Placynthiella icmalea, 15 Oct.
2003, W. R. Buck 45306 (NY - holotype).
MycoBank. MB844684
Basidiomata developing at the apices of host goniocysts,
superficial, subspherical, waxy-gelatinous, with a smooth
surface, pale brown, minuscule, 0.04-0.16 mm diam., of-
ten confluent, sometimes tuberculate and then up to 0.4 mm
diam. Context hyphae thick-walled, 1.5-2.5 pm; subba-
sidial hyphae thick-walled, 2-3.5 pm diam.; haustoria not
235
Diederich, Millanes, Wedin & Lawrey - Flora of Lichenicolous Fungi - Vol. 1. Basidiomycota - 2022
Tremella placynthiellae, USA, Missouri, holotype. A, Basidiospoies. B, Basidia in different stages of development. Scale bar 10 pm
Tremella placynthiellae, USA, Missouri, holotype. Basidiomata on the
thallus of Placynthiella icmalea. Scale bar 500 pm.
observed. Hymenium containing numerous subspherical to
ellipsoid probasidia with a basal clamp. Basidia, when ma-
ture, subspherical to ellipsoid or pyriform, 2-celled, with
a longitudinal, oblique or transverse septum, 6.5ù12(ù14)
* 5.5-9 pm; epibasidia cylindrical or tapering, 10-30 pm
long. Basidiospores ellipsoid, 5-6.5 x 4.5ù6.5 pm. Asexual
stage unknown.
Notes. This species is distinguished from most other li-
chenicolous Tremella species by the extremely small, pale
brown basidiomata, most not exceeding 0.16 mm in diam.,
and the very small basidia. Tremella coccocarpiae differs
by the smaller basidiospores, 5.5 x 4-4.5 pm, and the long-
er basidia, 11-15 x 6.5-9 pm; T. microcarpa differs by the
abundant haustoria, the slightly larger basidia, 9.5-12.5 x
7-11 pm, the occasional presence of stalked basidia, 17-20
x 8-10.5 pm, and the slightly larger basidiospores, 5.5-8.5
x 4.5-7 pm.
Ecology and host. On the thallus (goniocysts) of Placvn-
i hi el la icmalea over rotten wood.
Distribution. North America (USA: Missouri), known only
from the type locality.
Tremella placynthiellae
Tremella protoparmeliae Diederich & Coppins
in Diederich, Bibl. Uchenol. 61: 147 (1996). Type: UK, VC 62,
Famdale, Cleveland, on Protoparmelia badia, Sept. 1856, A.
C. Maingay s. n. (E - holotype).
Basidiomata reduced, in the hymenium of the host, mac-
roscopically not visible. Context hyphae not observed;
haustoria present on subbasidial hyphae, with clamp con-
nections. Hymenium reduced, clavate probasidia with a ba-
sal clamp situated in the hymenium of the host. Basidia,
when mature, narrowly ellipsoid to subcylindrical, with
one transverse septum (never oblique or longitudinal),
distinctly constricted at the septum, the lower cell only a
little longer than the upper cell, with an attenuated stalk-
like base, 29-39 x 8-10 pm (incl. stalk); epibasidia 3.5-4 5
pm thick, at least 30 pm long. Basidiospores subglobose,
8.S-9.5 x 6.5-8 pm. Asexual stage unknown.
Notes. This taxon is distinguished from most other intrahy-
menial species by the very long 1-septate basidia. The sim-
ilar T. rhizocarpicola differs by the dark brown swellings
on infected apothecia.
Ecology and host. In the hymenium of Protoparmelia badia.
Distribution. Europe (Norway; Sweden; UK: England,
Scotland).
Additional specimen (identified and communicated by B. Cop-
pins). Norway: Oppland, Ringebu komm., highest point on road
between Enden and Ringebu, near Muvatn, on saxicolous Pro-
toparmelia badia, 1977, Dalby (E).
References. Diederich 1996 [Millanes etal. 2014a|.