Name: Ganoderma applanatum
Author: (Pers.) Pat.
Citation: Hyménomyc. Eur. (Paris): 143 (1887) [nom. con.]
Deprecated Synonyms: Scindalma lipsiense, Polyporus concentricus, Scindalma stevenii, Ganoderma gelsicola, Ganoderma flabelliforme, Friesia applanata, Agaricus lipsiensis, Elfvingia applanata, Phaeoporus applanatus, Fomes longoporus, Fomes stevenii, Boletus lipsiensis, Fomes gelsicola, Polyporus merismoides, Fomes incrassatus, Ungularia subganodermica, Polyporus applanatus, Polyporus stevenii, Polyporus lipsiensis, Scindalma gelsicola, Polyporus subganodermicus, Ganoderma lipsiense (Batsch) G.F. Atk., Placodes applanatus, Boletus applanatus, Fomes applanatus
6. G. applanatum (Pers. ex Wallr.) Pat.
Spores measure 6.5-8-5 × 4′5-6’5 (7-8 X 5"5) [L, Q= 1"42, being significantly smaller than those of the other British species, and are ovoid to
ellipsoid with an applanate to slightly convex adaxial surface and a strongly curved abaxial surface. The perisporial membrane forms an obtusely conical
outline to the spore apex in younger spores but this finally collapses to give a truncated discoid region I 5-2.5 it diam., with an irregular margin. Ultra- structural examination reveals the perisporium as a smooth continuous
membrane over the entire spore surface, except for the apex, which develops
a series of irregular elongated depressions approximately parallel to the
longitudinal axis of the spore. These depressions break down as slit-like
openings in between the underlying exosporial verrucae. Removal of the
perisporium with chromic acid, reveals the exosporial ornament in the form
of small, low verrucae, measuring 0o2-0-4 X o 2-o0’5 [, either truncated or
with a flattened peltate apex. The apices are fused to the overlying perisporial
layer, but the intervening spaces prevent any fusion with adjacent verrucae, either at their apices or by connectives. Although there are numerous verru-
cae, about 180-230, their elevation is very low, being comparable with that found in G. resinaceum,and similarly this ornament is scarcely visible with
light microscopy. A suprahilar plage area is consistently found, although it may be indistinctly developed, with an exposed, crowded exosporial orna- ment. The small hilar appendix is scarcely visible, and bears an open-pore hilum. Fig. 2/6; pl. 25.
SPECIMEN EXAMINED: Huntingdon, 26 Oct. 1959, Dennis & Gilbert.
G. applanatum is known as a conk, which is a general term for a fungus that destroys wood. It is a called a white rot fungus due to its ability to digest the brown lignin in a tree as food source and leave behind the white cellulose.
G. applanatum, appropriately dubbed a shelf fungus due to the shape, is a fan-shaped polypore that can range from 30-70 cm long, making it very noticeable in the woods. It has a thick, hard, lumpy, brown top with several radiating zones. The spore surface is ochre in color, unless scratched off in which case the spore surface becomes brown. The pores of the spore surface are tiny and regular in shape.
Each year, G. applanatum creates a new pore surface, giving it a “stacked” appearance.
Its common name is the artist’s conk because of the pictures one can draw when the white pore surface is scratched to reveal a brown color.
For the nomeclature of our British Columbia collections and postings of polypores we follow
Ginns, J. 2017. Polypores of British Columbia (Fungi: Basidiomycota).
Ministry of Forests, Lands, and NR Operations, Technical Report 104. ISBN
978-0-7726-7053-3 (Print version) & ISBN 978-0-7726-7054-0 (Digital version)
but a typo. Clean up the name pages, or get rid of them. They are confusing. Deprecate them and follow Index/Species Fungorum for the correct spelling and authorities. Don’t waste the time on keeping the name pages. Most of the time they are too amateurish and confusing. Adolf
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