First person to use this name on MO: Erlon Bailey
Name: Ganoderma subgenus Elfvingia
Author: (P. Karst.) Imazeki
Type: G. applanatum (Polyporus applanatus (Pers. ex S.F. Gray) Wallr.)
Non-laccate species where the palisade of club-shaped cells is absent in the surface of the basidiomes. -Imazeki (1952)
Non-laccate upper pilear surface, thick cuticle of trichodermic, anamixodermic, or plecodermic composition and uniformly brown, dark brown, or chestnut brown context. -Zhao & Zhang (2000)
Richter, C., Wittstein, K., Kirk, P. M., & Stadler, M. (2015). An assessment of the taxonomy and chemotaxonomy of Ganoderma. Fungal Diversity, 71(1), 1-15.
“Nuclear ribosomal DNA ITS sequences have been used to investigate phylogenetic relationships between 34 Ganoderma isolates cultivated in China. Five distinct groups were identified: the subgenus Elfvingia, the sect. Phaeonema, and three groups within the sect. Ganoderma. Most of the Ganoderma isolates (85.7%) formed a single group within the sect. Ganoderma. The result indicated clear genetic diversity between the subgenus Elfvingia and the sects Phaeonema and Ganoderma, but a smaller degree of genetic diversity between the three groups placed within the sect. Ganoderma. Analysis of molecular data is a more effective and useful approach for studying the taxonomy of Ganoderma, and for establishing phylogenetic relationships within the genus, compared to methods based on fruiting body morphology.” (Wei Sheng Wu Xue Bao. 2007 Feb;47(1):11-6.) http://www.ncbi.nlm.nih.gov/pubmed/17436616
“Ganoderma applanatum and G. lobatum classified in subgenus Elfvingia made a monophyletic group.” (Mycologia July/August 2004 vol. 96 no. 4 742-755) http://www.mycologia.org/content/96/4/742.abstract
“Macro- and micromorphology of 124 specimens and 11 holotypes of South American taxa of subgenus Elfvingia (= G. applanatum complex) were examined, and were compared with isoenzymic data previously obtained. Two major dermis types were defined and illustrated. Spore ornamentation was inspected under SEM. Sixty-four per cent of the specimens had an anamixodermis, 80% had spores with longitudinal furrows under SEM and 83% had a context layer without streaks of melanoid deposits. Some of our South American collections could be ascribed to G. lipsiense, G. tornatum, G. testaceum and G. lobatum. Other taxa are critically discussed. The position adopted in this work was to join under synonymy closely related taxa on the grounds of morphology and geographical distribution. In general, correlation between morphological features and isoenzymic patterns could not be established. In this group, phenotypic plasticity appears to be great.”
Taxonomy of Ganoderma from southern South America: subgenus Elfvingia – ResearchGate. Available from: http://www.researchgate.net/... [accessed Aug 23, 2015].
“Currently, laccate Ganoderma and non-laccate Elfvingia have been widely accepted as two subgenera of Ganoderma. Smith and Sivasithamparam 20 stated that the phylogeny inferring from the nrDNA ITS sequences of five species of Ganoderma from Australia also supported the retention of these two subgenera. However, we found that the universally accepted laccate species and dull species (Table 1) are interspersed throughout the clades and do not form two distinct groups (laccate and dull) in the phylogenetic tree (Figure 2). Our study indicates that the grouping based on the presence or absence of laccate shine is easy to use in practice, but it does not reflect true phylogenetic relationship.” (Clarification of the Concept of Ganoderma orbiforme with High Morphological Plasticity Published: May 29, 2014DOI: 10.1371/journal.pone.0098733) http://journals.plos.org/...
should be deprecated in light of the fact that it does not appear to be synonomous with Ganoderma subgenus Elfvingia since the latter includes at least one laccate taxon (G. mutabile) and the former does not I think.