IDENTIFICATION OF PTERIDOPHYTA PLANTS IN JEMBER, EAST JAVA INDONESIA

Pteridophyta is a group of plants known by the common name Ferns. This plant is one of the constituent elements of the worlds biodiversity, including in Indonesia. From many provinces in Indonesia, one of them is East Java Province, and one of the cities in this province is the city of Jember. The location of the research is, is in Kaliwates District, Jember City, East Java Province, Indonesia at position 8⁰ 11 29-32 S 113⁰ 41 24-26 E (google earth). There are still many types of plants that grow in this area and not many are known about the species, both from the herbaceous plants Spermatophyta, as well as from the Pteridophyta group. This study aims to identify the types of ferns/ferns, which are a group of Pteridophyta plants, which exist in this area. The research was carried out from December 2021 to January 2022. This research is exploratory descriptive research, which reveals facts that are found in the field and seek to describe them precisely. Sampling was carried out by roaming method throughout the target area. Green open space with an area of ​​5448 m², which is part of approximately 184 m² area that is overgrown with ferns. Measurement of abiotic factors obtained regarding the average daily air temperature of 29.2⁰ C, average humidity of 78%, and average wind speed of 2 km/hour. The results of the identification of ferns showed that in an area of ​​184 m², there were 10 species of ferns from 6 families. Data on a total plot area of ​​20 m² sampled area, wasobtained for each species with the following amounts: Family 1. Pteridaceae  Pityrogrammacalomelanos (316), Pterisensiformis (68), Pterisbiaurita (16), Pteris sp. (427). family 2. Polypodiaceae Drynariaquersifolia (354). family 3. Lomariopsidaceae Nephrolepisexaltata (408), Nephrolepis sp (387). Family 4. Blechnaceae: Blechnumorientale (57). family 5. Tectariaceae Tectariaangulata (12). Family 6. Thelypteridaceae Thelypteris sp. (62). There are only 10 species of Pteridophyta found in the research location. Pityrogrammacalomelanos, Drynariaquercifolia, Nephrolepisexalta, Nephrolepis sp. and Pteris sp. Pterisensiformis, Blechnumorientale, Ptelypteris sp. Pterisbiaurita and Tectariaangulata.