Abstract
Lactifluusrussulisporus Dierickx & De Crop and Lactifluuscaliendrifer Froyen & De Crop are described from eucalypt forests in Queensland, Australia and different forest types in Thailand, respectively. Both species have recently been published on Index Fungorum and fit morphologically and molecularly in L.sect.Luteoli, a section within L.subg.Gymnocarpi that encompasses species with alboochraceous basidiomes, white latex that stains brown and typical capitate elements in the pileipellis and/or marginal cells.
Highlights
Since the division of Lactarius into Lactarius sensu novo and Lactifluus (Buyck et al 2008), our understanding of both genera has increased significantly
For L. russulisporus, fieldwork in 2010 and 2012 by Roy Halling and collaborators resulted in two collections of the species, which are deposited in The William and Lynda Steere Herbarium of the New York Botanical Garden (NY) and the Queensland Herbarium (BRI)
In congruence with De Crop et al (2017), our molecular results show that the collections from Australia as well as those from Thailand belong to Lactifluus. subg
Summary
Since the division of Lactarius into Lactarius sensu novo and Lactifluus (Buyck et al 2008), our understanding of both genera has increased significantly. Lactifluus is the smaller of the two genera, it is characterised by a higher genetic diversity with subgroups in very different and genetically distant clades (De Crop et al 2017). The latter contains four sections, apart from five isolated species and one unnamed clade: L. sect. De Crop et al (2017) illustrates the existence of two new sister species, one from Thailand and one from Australia, within the latter section. These two sister species were recently published on Index Fungorum (Dierickx et al 2019) with a short description, but are fully described in this paper: L. caliendrifer from Thailand and L. russulisporus from Australia. While in De Crop et al (2017) four loci (ITS, LSU, RPB1 and RPB2) were used to construct the phylogeny, here only ITS is used
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