Panus roseus (Karun., K.D. Hyde & Zhu L. Yang) N. Vinjusha & T.K.A. Kumar, 2021

Arun Kumar, T. K., 2021, Two new combinations in the genus Panus (Panaceae, Polyporales) based on morphology and molecular phylogeny, Phytotaxa 514 (3), pp. 287-294 : 289-291

Panus roseus (Karun., K.D. Hyde & Zhu L. Yang) N. Vinjusha & T.K.A. Kumar comb. nov.

Basionym:— Lentinus roseus Karunarathna, K.D. Hyde & Zhu L. Yang , in Karunarathna, Yang, Zhao, Vellinga, Bahkali, Chukeatirote & Hyde, Mycol. Progr. 10 (4): 392 (2011)). MycoBank: 518240, from Thailand.

According to Karunarathna et al. (2011), Panus roseus is characterized by a relatively small basidiome, with coriaceous, deeply cyathiform, pink-coloured pileus, dimitic hyphal system, with thick-walled unbranched skeletal hyphae, presence of clavate, cheilocystidia and metuloids, and ellipsoid to elongate basidiospores.

For full taxonomic description and comparison with related species, see Karunarathna et al. (2011).

Remarks:— Type material of Panus roseus was not examined in this study. The new combination is based on morphological characters from the original description of P. roseus (as “ L. roseus ”, Karunarathna et al. 2011 ), and based on molecular phylogenetic analysis with the available GenBank sequence of the species from China.

Molecular characterization

A BLAST search, using the ITS sequence of the specimen AK61b (described as Lentinus bambusinus by Kumar & Manimohan 2005), resulted in 93%and 94.5% identity with two undescribed Panus species from India (GenBank numbers-KP686453, MG279699 respectively). BLAST result also showed 94% similarity with an accession of Neolentinus kauffmanii (A.H. Sm.) Redhead & Ginns (1985: 357) (earlier treated in Panus , as P. kauffmanii (A.H. Sm.) Corner (1981: 64) (GenBank number-JQ428821), 91% similarity with accessions of Panus strigellus (GenBank numbers-MW407012, JQ955724 , JQ955727 ) and 90% identity with accessions of Panus conchatus (GenBank numbers-MK192053, MH857778 , MG231758 ).

The phylogenetic tree ( Fig. 2 ) shows the placement of “ Lentinus bambusinus ” with related taxa in the order Polyporales Gäum. In the tree, “ Lentinus bambusinus ” resolved as a distinct taxon along with two undescribed species of Panus , with 96% bootstrap support. In the analysis, the species “ Panus roseus ” formed a sister clade with Panus conchatus , with 93% bootstrap support. Both the species, L. bambusinus and L. roseus showed no phylogenetic affinities with the members of the genus Lentinus .

Figures

FIGURE 2. Maximum Likelihood tree generated using ITS sequence data. Values at the nodes indicate Maximum Likelihood bootstrap values. Bootstrap values above 50% are shown. Bold names represent the new combinations in Panus. GenBank numbers and voucher localities are given along with the taxa. *=Sequence unpublished.