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Black rot on orchids is caused by Pythium and Phytophthora species. [1] Black rot targets a variety of orchids but Cattleya orchids are especially susceptible. [1] Pythium ultimum and Phytophthora cactorum are known to cause black rot in orchids. [1] Pythium ultimum is a pathogen that causes damping-off and root rot on plants. [2]
Liparis bracteata, commonly known as the yellow sphinx orchid, [2] is a plant in the orchid family. It is an epiphytic or lithophytic orchid with cone-shaped pseudobulbs , each with two linear to lance-shaped leaves and between seven and twelve star-shaped pale green flowers that turn yellow as they age.
Pterostylis arbuscula, commonly known as dark banded greenhood, [2] or mallee banded greenhood, [3] is a species of orchid endemic to the south of continental Australia. It has a rosette of leaves borne above the ground and up to 3 dark reddish brown to blackish brown to green flowers with white bands, and is found in Western Australia and South Australia.
Pterostylis sanguinea, commonly known as the red-banded greenhood [2] or dark-banded greenhood, [3] is a plant in the orchid family Orchidaceae and is endemic to southern Australia. The plants either have a rosette of leaves in the years when not flowering or stem leaves on a flowering spike.
Dendrobium mirbelianum, commonly known as the dark-stemmed antler orchid [2] or mangrove orchid, [3] is an epiphytic or lithophytic orchid in the family Orchidaceae. It has cylindrical, dark-coloured pseudobulbs with leathery, dark green leaves and up to twelve pale to dark brown flowers with a yellow labellum with dark red veins.
Diuris behrii, commonly known as golden cowslips, [2] is a species of orchid which is endemic to southern continental Australia. It has between three and six grass-like leaves and a flowering stem with up to four drooping, yellow flowers with dark streaks on the labellum. The flowers appear between September and November in its native range.
Luisia tristis, commonly known as the velvet orchid, [2] is a species of epiphytic or lithophytic orchid with wiry stems often forming tangled clumps, cylindrical leaves and flowering stems with up to three green flowers with a dark red to dark maroon labellum. This orchid occurs in tropical Asia, New Guinea, Australia and some islands of the ...
This orchid has erect and glabrous multiple stems. The leaves are dark green, long and narrowly tapering (hence the common name "sword-leaved helleborine"). The inflorescence is a lax, 5-20 flowered spike with the bell-shaped flowers ascending in an oblique spiral.