Saint Gallicanus was a Roman martyr in Egypt in 363 AD, during the reign of Julian. According to his "Acta" (in Acta SS., June, VII, 31), he was a distinguished general in the war against the Persians. He was also consul with Symmachus in 330 and perhaps also once before with Caesonius Bassus in 317. After his conversion to Christianity he retired to Ostia, founded a hospital where he worked with Saint Hilarinus and endowed a church built by Constantine I. Under Julian he was banished to Egypt, and lived with the hermits in the desert. A small church was built in his honour in the Trastevere of Rome. His relics are at Rome in the church of Sant'Andrea della Valle. The legend of his conversion was dramatized in the tenth century by the nun Roswitha. He is commemorated on 25 June.
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This article incorporates text from a publication now in the public domain: Herbermann, Charles, ed. (1913). "Sts. Gallicanus". Catholic Encyclopedia. New York: Robert Appleton Company.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction