Robbert Gradstein

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Myriocoleopsis fluviatilis is a species of liverworts in the family Lejeuneaceae. It is endemic to Brazil. Its natural habitat is rivers. It is threatened by habitat loss.

Haesselia roraimensis is a species of liverwort in the family Cephaloziaceae. It is endemic to Guyana. Its natural habitat is on rotten logs in periodically flooded riverine forest from 550–1,550 m (1,800–5,090 ft) elevation, in the humid submontane tropical 'mossy' forests on the slopes of Mount Roraima, where the borders of Brazil, Venezuela, and Guyana meet.

Spruceanthus theobromae is a species of liverwort in the family Lejeuneaceae. It is endemic to Ecuador, where it is the only liverwort species known to be endemic to the western foothills of the Ecuadorian Andes.

Fulfordianthus evansii is a species of liverwort in the family Lejeuneaceae. It is found in Belize, Costa Rica, Guatemala, and Panama. Its natural habitat is subtropical or tropical moist lowland forests.

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Caudalejeunea grolleana is a species of liverwort in the family Lejeuneaceae. It is an endangered species endemic to Madagascar.

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Haesselia is a genus of liverworts in the family Cephaloziaceae. It contains the following species (but this list may be incomplete): Haesselia roraimensis Grolle & Gradst. Haesselia acuminata Gradst. The genus name of Haesselia is in honour of Gabriela Hässel de Menéndez (1927-2009), who was an Argentine bryologist. The genus was circumscribed by Riclef Grolle and Stephan Robbert Gradstein in 1988.

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Fulfordianthus is a genus of liverworts in the family Lejeuneaceae. It is found in central and southern America. It contains the following species: Fulfordianthus evansii (Fulf.) Gradst. Fulfordianthus pterobryoides (Spruce) Gradst. The genus name of Fulfordianthus is in honour of Margaret Hannah Fulford (1904–1999), who was an American bryologist who was active in identifying the flora of North and South America. The genus was circumscribed by Stephan Robbert Gradstein in Bryologist Vol.95 on page 44 in 1992.

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