Cryptic fern
WebThe "great fern radiation" occurred in the late-Cretaceous, when many modern families of ferns first appeared. One problem with fern classification is the problem of cryptic species. Cryptic species are those which are morphologically similar to another species, but which differ genetically in ways that prevent fertile interbreeding. WebCryptic Fern has to date been confirmed on only a few occasions, the most recent being May 2024 in Kent. Although dissection required, Cryptic Fern is noted in some …
Cryptic fern
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WebWhile most studies of fern ecology focus on the more visible sporophytic stage, the gametophyte is critically important, as it is the sexual phase of the life cycle. Yet, fern gametophytes have long been neglected in field studies due to their small size and cryptic morphology. DNA barcoding is a powerful method that can be used to WebThe newly defined fern genus Leptochilus contains about 50 species occurring in subtropical to tropical Asia and adjacent Pacific islands. The circumscription and phylogeny of the genus have been ambiguous and its species had been included in various genera such as Colysis, Dendroglossa, Kontumia, Microsorum, and Paraleptochilus.
WebAlthough the south type and the other two meet in several regions, complete cross-sterility between them seems to sustain their genetic distinctiveness in spite of occasional crossing. The results from the present study suggest that widely distributed fern species are apt to comprise several cryptic species. WebFern identification usually requires the use of mature sporophytes, since attempts to identify juveniles using morphological traits often provides unsatisfactory results. Here we examined young sporophytes found among boulders in a river basin of a xeric valley in central Peru. Attempts to identify these sporophytes first pointed to four different genera, two in …
WebFeb 12, 2024 · Cryptic species are present throughout the tree of life. They are especially prevalent in ferns, because of processes such hybridization, polyploidy, and reticulate … WebApr 12, 2024 · While most studies of fern ecology focus on the more visible sporophytic stage, the gametophyte is critically important, as it is the sexual phase of the life cycle. …
WebFor the taxonomic revision of the problematic species Ceratopteris thalictroides, molecular analyses and crossing tests were conducted for 16 sources in the world. An analysis of allozyme composition of five enzymes revealed the presence of three intraspecific entities, which were called the south type, the north type, and the third type. An analysis of the …
WebMay 11, 2024 · Ferns are prehistoric plants thought to be around before the dinosaurs. When properly cared for, a crispy wave specimen will brighten your living space while … 12晶振机器周期WebA brief jaunt up a steep slope composed of unstable volcanic talus to search for a recently-discovered population of a pumice-loving fern, with Abies magnifi... 12智力附魔材料WebFeb 12, 2024 · Cryptic species are present throughout the tree of life. They are especially prevalent in ferns, because of processes such hybridization, polyploidy, and reticulate evolution. In addition, the morphological simple body plan of ferns limits phenotypic variation and makes it di cult to detect crypic species in ferns without molecular work. The ... 12智力图纸WebMar 1, 2024 · Yet, fern gametophytes have long been neglected in field studies due to their small size and cryptic morphology. DNA barcoding is a powerful method that can be used to identify field‐collected gametophytes to species and allow for … 12晶恵丸WebApr 18, 2008 · Cryptic species in ferns. Findings of cryptic species, the entities being morphologically indistinguishable but reproductively isolated (Grant 1981; Paris et al. … 12智力附魔Webdifferent problem of cryptic species at the same ploidy level. We also explore the factors that have obscured species boundaries in the ferns and demonstrate how new systematic methods are increasing our ability to define those boundaries. Finally we consider the practical problems posed by cryptic species to fern systematics and taxonomy. 12智力宝石图纸WebJul 12, 2011 · Ceratopteris thalictroides (L.) Brongn. (Parkeriaceae) is a taxonomically difficult species. It is a tetraploid (2 n = 156), semi-aquatic, annual, homosporous fern with a wide geographic distribution in the tropical and subtropical regions of the world (Watano and Masuyama 1994; Masuyama and Watano 2005; Adjie et al. 2007 ). 12暗强