Olaf Rainer Gruss

Phalaenopsis bastianii is a species of orchid endemic to the Philippines. Similar in form to a miniature Phalaenopsis lueddemanniana, the colour of the flower is similar to that of Phalaenopsis mariae.

Paphiopedilum tranlienianum is a species of orchid endemic to Cao Bằng.

Paphiopedilum vietnamense is a species of orchid found from Thái Nguyên Province in northern Vietnam. It was discovered in 1997 and it is endangered.

Coelogyne usitana is a species of orchid discovered in the late 1990s. It was named in honour of the collector Villamor T. Usita, by Jürgen Röth and Olaf Gruss in the German orchid magazine Die Orchidee. It was discovered in central-east Mindanao, Philippines where it grows at elevations of about 800 metres on the horizontal branches of trees. The inflorescence can bear 30 or more flowers over a long period of time, with only one or two blooms open at a time. The flowers are about 6 cm in diameter and face the downward, possibly to shield the bloom from rain. The colour contrast in the

Phragmipedium tetzlaffianum is a species of orchid endemic to Venezuela.

Phragmipedium richteri is a natural hybrid (P. boissierianum × pearcei) of orchid endemic to Peru.

Paphiopedilum hangianum is a species of slipper orchid in the family Orchidaceae, endemic to northern Vietnam and China. Due to overcollection and habitat loss, the species is considered endangered and is listed under international conservation agreements.

Phalaenopsis luteola is a species of flowering plant in the Family Orchidaceae. It is endemic to Borneo. The specific epithet luteola, from the Latin luteolus meaning "yellowish", refers to the floral colouration.

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Phalaenopsis thailandica is a species of orchid native to Thailand. It was described by Olaf Gruss and Jürgen Roeth, after differences from the type description were noticed in cultivated plants labeled as Phalaenopsis gibbosa. The specific epithet thailandica refers to this species native range in Thailand.

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Paphiopedilum subgenus Megastaminodium is a subgenus of the orchid genus Paphiopedilum. It was erected to accommodate the single species Paphiopedilum canhii due to its distinct characteristics that made it unfit for the other subgenera. Its placement has since been backed by cytological, molecular and micromorphological evidence.

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Phalaenopsis mentawaiensis is a species of orchid endemic to Sumatra, Indonesia. The specific epithet mentawaiensis refers to the Mentawai islands of West Sumatra.

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Phalaenopsis × lotubela is a species of epiphytic orchid native to the island Sumatra of Indonesia. It is a hybrid of Phalaenopsis cornu-cervi and Phalaenopsis javanica.