Rolla M. Tryon Jr.

Blotiella is a genus of ferns in the family Dennstaedtiaceae described as a genus in 1962. The genus was named in honor of Marie Laure Tardieu-Blot (1902–1998), who was a French pteridologist. It was first published in Contr. Gray Herb. vol.191 on page 96 in 1962 by Rolla Milton Tryon.

Sphaeropteris cooperi, synonym Cyathea cooperi, also known as lacy tree fern, scaly tree fern, coin spot tree fern, or Cooper's tree fern, is a tree fern native to Australia, in New South Wales and Queensland.

Sphaeropteris excelsa, synonym Cyathea brownii, commonly known as the Norfolk tree fern or smooth tree fern, is probably the largest fern species in the world. It is endemic to Norfolk Island, in the Pacific Ocean near Australia and New Zealand. It is named after the botanist Robert Brown (1773-1858).

Selaginella carinata is a species of plant in the Selaginellaceae family. It is endemic to Ecuador. Its natural habitat is subtropical or tropical moist montane forests and it is threatened by habitat loss.

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Alsophila manniana, synonym Cyathea manniana, the spiny tree fern or sheshino, is a species of tree fern. It is readily identified by the fierce spines on its trunk, and is widespread in the tropical regions of Africa.

Alsophila javanica, synonym Cyathea javanica, is a species of tree fern native to western Java and Sumatra, in Indonesia. It grows in rain forest and on riverbanks at an altitude of 250–1500 m.

Alsophila havilandii, synonym Cyathea havilandii, is a species of tree fern endemic to Kinabalu National Park in Borneo, where it grows in ridge forest at an altitude of 2,400–3,000 m (7,900–9,800 ft). It is a rather small species, having an erect trunk about 50 cm (20 in) tall or more. Fronds are narrow, erect and tripinnate. They are usually about 1 m (3 ft 3 in) in length. The stipe is dark and warty. It bears medium brown scales with fragile edges. Sori are borne on either side of the midvein of fertile pinnules and protected by firm, dark indusia. The specific epithet havilandii

Alsophila dregei, synonym Cyathea dregei, (common tree fern or gewone boomvaring in Afrikaans) is a widespread species of tree fern in southern Africa. Within South Africa, it co-occurs with the indigenous forest tree fern (Gymnosphaera capensis) and the invasive Sphaeropteris cooperi from Australia. Further north, outside of South Africa, it coexists with an additional two tree fern species, A. manniana and A. thomsonii. This species is locally known as the common South African tree fern or grassland tree fern (in contrast to its relative, the forest tree fern). It is commonly known as the

Alsophila brooksii, synonym Cyathea brooksii, is a species of tree fern native to Cuba, Hispaniola and Puerto Rico, where it grows on serpentine soils in shaded ravines, along streams, and on forested slopes at an altitude of 250–950 m. The trunk is prostrate and only about 6 cm in diameter. Fronds are pinnate or bipinnate and up to 2 m long. The base of the rachis is covered with blackish scales that have a paler margin. Sori occur in two rows, one along each side of the pinnule midvein. In the wild, A. brooksii is known to hybridise with Alsophila fulgens and Alsophila portoricensis,

Alsophila acanthophora, synonym Cyathea acanthophora, is a species of tree fern endemic to Kinabalu National Park in Borneo, where it grows in montane rain forest at an altitude of 1250–2000 m. The trunk is erect and can grow as tall as 5 m or higher. Fronds are 2–3 m in length and bi- or tripinnate. The stipe is dark towards the base and has slender spines. It is covered with scattered scales, which are glossy brown and have a narrow paler margin. Sori occur near the midvein of fertile pinnules. They are covered in thin, fragile indusia, which resemble small saucers.

Alsophila abbottii, synonym Cyathea abbottii, is a species of tree fern in the family Cyatheaceae. It is endemic to Hispaniola, where it grows in shaded montane forest at an elevation of 700–1200 m. The trunk is erect and can grow up to 1.6 m in height and 5 cm in diameter. Fronds may reach 1.5 m in length and are pinnate. The rachis is brown and is covered in golden-brown to bicoloured (pale and brown) basal scales. Sori are arranged in two rows along each side of the pinnule midvein. Indusia are rounded and in the shape of a cup. The species is named after William Louis Abbott (1860-1936),

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Sphaeropteris quindiuensis, is a species of tree fern in the family Cyatheaceae. It is native to Colombia, Ecuador, Peru and Bolivia.

Sphaeropteris brunoniana, synonym Cyathea brunoniana, is a fern in the family Cyatheaceae.

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Osmunda × ruggii is a sterile hybrid between Claytosmunda claytoniana and Osmunda spectabilis.

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Alsophila latipinnula, synonym Cyathea latipinnula, is a species of tree fern native to the Philippines, where it grows in ridge forest at an altitude of about 1400 m. The trunk of this plant is erect and grows to 1–2 m in height and 10 cm in diameter. Fronds may be bi- or tripinnate and 1–2 m in length. The stipe is spiny and bears a few narrow, brown basal scales. Sori are borne near the fertile pinnule midvein and are protected by small, dark indusia.