Phytophthora de Bary
Phytophthora de Bary includes mainly ecologically and economically important plant pathogens (e.g. Kroon et al. 2004; Brasier et al. 2005; Balci et al. 2007), but also species that have not been yet associated with disease (Hansen et al. 2012) and that are abundantly distributed in forested streams (Reeser et al. 2011). The genus is currently subdivided into 10 well-recognized ITS clades (Kroon et al. 2012), plus the novel lineage represented by P. stricta (Yang et al. 2014a). Multigene phylogenies have shown that most of the 10 clades are monophyletic, except the Clades 4 and 9 (Blair et al. 2008). Clade 9 is the most rapidly expanding, with most of its species recently described (Hong et al. 2010, 2012; Naher et al. 2011; Rea et al. 2011; Yang and Hong 2013; Yang et al. 2014a, b). Members of this clade generally produce non-papillate and non-caducous zoosporangia. A well-defined subclade of species within Clade 9 have a relatively high-temperature optima, ca. 30 – 32 °C, and are able to tolerate up to 40 °C (Yang et al. 2014a). In this contribution, we describe two new species for the Phytophthora ITS Clade 9, which both fall into this hightemperature optima subclade (Fig. 1).

Fig. 1 Phylogramgenerated from Maximum likelihood (ML) analysis (PhyML 3.1, Guindon and Gascuel 2003) based on entire ITS rDNA sequences showing the phylogenetic placement of Phytophthora rhizophorae and P. estuarina within Phytophthora Clade 9. ML bootstrap support values < 50 % are marked with (-). Clades that do not appear in the Bayesian analysis are indicated with a zero. Bayesian posterior probability values (MrBayes 3.2, Ronquist et al. 2012) > 0.50 are labelled numerically. Scale bar indicates the average number of substitutions per site. New taxa are in blue and species for which obtained sequences are based on type material have names in bold.
Species