Nothophytophthora gen. nov., a new sister genus of Phytophthora from natural and semi-natural ecosystems

. 2017 Aug 7;39:143–174. doi: 10.3767/persoonia.2017.39.07

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Fig. 4 — Morphological structures of *Nothophytophthora amphigynosa*. — a–j. Non-papillate sporangia with a conspicuous basal plug formed on V8 agar flooded with soil extract. a–e. Sporangia borne terminally on unbranched sporangiophores; a–c. ovoid; c. with a slightly curved apex; d. ellipsoid; e. limoniform with slightly lateral attachment of the sporangiophore; f–j. sporangia with external proliferation immediately below sporangial base (arrows); f. ovoid with vacuole; g. elongated obpyriform with slightly lateral attachment of the sporangiophore; h. elongated-ovoid with already differentiated zoospores; i. same sporangium as in h releasing zoospores; j. lax sympodium of two ovoid sporangia. — k–p. Smooth-walled mature oogonia with non-tapering bases and short, thin stalks, containing plerotic, medium thick-walled oospores with each one large ooplast and one nucleus, formed in single culture in V8A; k–o. globose to subglobose with amphigynous antheridia; p. globose with paragynous antheridium behind oogonial stalk; q. slightly elongated with tapering base and amphigynous antheridium; r–s. elongated-ellipsoid with tapering bases, slightly elongated almost plerotic oospores and amphigynous antheridia; t. smooth-walled oogonium aborted before forming an oospore. — Scale bar = 25 μm, applies to a–t.

Fig. 4.