Spore morphology of Onychium ipii Ching (Pteridoideae, Pteridaceae)

Abstract

Summary. The ultrastructure of the spore surface of Onychium ipii Ching (Pteridoideae, Pteridaceae) was investigated by using of scanning electron microscopy. Spores of Onychium ipii are trilete, tetrahedral, with hemispherical distal side and convex proximal one. Equatorial diameter 42.4-48.1 μm, polar axis 35.7-40.6 μm. Distal and proximal sides are separated by an equatorial flange, which protrudes on 4.3-4.8 μm all around the spore. Tubercles of different size form the interrupt "laesura lips" situated on both sides of laesura arms. Proximal side of spore with three stright ridges 3.1-4.5 μm width arranged parallel to spore margins and formed triangle in outline. университет, пр. Ленина, 36, г. Томск, 634050, Россия. E-mail: gureyeva@yandex.ru Ключевые слова: морфология спор, сканирующая электронная микроскопия (СЭМ), Onychium ipii, Pteridaceae, Pteridoideae. Морфология спор Onychium ipiiАннотация. Методом сканирующей электронной микроскопии проведено сравнительное исследование морфологии спор Onychium ipii Ching. Выявлены основные признаки, характерные для спор вида. Споры трехлучевые, тетраэдрические, в проксимально-полярном и дистально-полярном положениях треугольно-округлые, стороны споры слегка выпуклые. В экваториальном положении проксимальная сторона выпуклая, дистальная -полусферическая. Экваториальный диаметр 42,4-48,1 мкм, полярная ось 35,7-40,6 мкм. Прокси-мальная и дистальная стороны разделяются хорошо выраженной экваториальной складкой 4,3-4,8 мкм шир., с выемками в углах споры. Лучи лезуры прямые, с расположенными в ряд по обеим сторонам каждого луча дис-кретными бугорками разного размера. Дистальная сторона споры извилисто-складчатая, с редкими неболь-шими ареолами. Близ экваториальной складки бугорки и складки дистальной стороны сливаются в сплошную складку, располагающуюся вокруг споры параллельно экваториальной. Проксимальная сторона с тремя пря-Turczaninowia 20 (2): 56-63 (2017)

Taxonomy and spore morphology of selected taxa of Cheilanthoideae and Pteridoideae (Pteridaceae) from Pakistan

“…emodi), terminate more abruptly into a usually long apical segment; frond apex suddenly reduced to an abrupt, usually long drooping terminal segment; lamina unipinnate, oblong, lanceolate (Figure 6f); sori located on the overall both margins of lamina, spore trilete, triangular with laesura in proximal view, spheroidal, hemispherical at distal view with spinulose, tuberculate surface, equatorial view with equilateral flange at the middle, size 36-45 Â 37-48 μm, surface cristate, granulose, tuberculate at proximal view, granulose, cristate at distal view (Figure 10a-c). The spore morphology of Cheilanthoideae and Pteridoideae (Pteridaceae) species observed under SEM represents variations in size, shape, aperture and surface ornamentation, as described in many previous studies (Giacosa, Morbelli, & Giudice, 2004;Makgomol, 2006;Nayar & Devi, 1966, 1967Vaganov, Gureyeva, Shmakov, Kuznetsov, & Romanets, 2018a, 2018b et al ( ) and Vaganov et al (2017et al ( , 2020. The spores of Pteris cretica subsp.…”

“…Duthie (1898); Hope (1896) documented nine taxa of Pteridaceae from northern areas, Pakistan;Stewart (1972) documented 6 genera with 22 taxa of Cheilanthoideae and Pteridoideae from Pakistan; Lee, Oh, and Lee (1990) documented the taxonomy and spore morphology of Pteridaceae from Korea; Nakaike andMalik (1992, 1993) reported 4 genera with 11 taxa of Cheilanthoideae and Pteridoideae from various localities of Azad Jammu and Kashmir, Gilgit-Baltistan, Hazara and Malakand divisions; Morbelli, Ponce, MacLuf, and Piñeiro (2001) documented the spore morphology of Notholaena species through scanning electron microscopy from South America. Sen and Mukhopadhay (2011) documented the spore morphology of five Species of Cheilanthes through LM and SEM from India; Fraser-Jenkins (2014) and Fraser-Jenkins et al (2016) documented 8 genera with 26 taxa of Cheilanthoideae and Pteridoideae, with a comprehensive specimen based inventory of the pteridophytes of Pakistan; Gul, Alam, Ahmad, and Irfan (2016) reported 5 genera with 18 taxa of Cheilanthoideae and Pteridoideae from district Mansehra, Pakistan; Chao, Mustapeng, Chen, and Chiou (2017) evaluated the spore morphology of Pteris borneensis, P. decrescens and P. parviloba, Pteridaceae through SEM from Borneo Island; Masoumi, Ghasempour, and Sobhi (2017) documented the spore morphology and developmental stages of Cheilanthes persica from Kermanshah, Iran; Vaganov, Gureyeva, Kuznetsov, Shmakov, and Romanets (2017) documented the spore morphology through SEM of Onychium ippi, Pteridoideae, Pteridaceae from China; Chao and Huang (2018) documented the spore morphology through SEM of 57 species of pteridaceae; Shah, Çelik, Ahmad, et al (2019)…”

Spore morphology of Haplopteris C. Presl species (Vittarioideae, Pteridaceae) from China

“…Flora of China includes 13 species (Zhang et al, 2013). Our previous studies of spores of some Pteridaceae groups are shown that spore morphology studied using SEM-method and molecular-phylogenetic results are congruent for different genera such as Onichium (Vaganov et al, 2017a), Pityrogramma (Vaganov et al, 2017b), Vaginularia (Vaganov et al, 2017c). Morphology of spores is very important for systematics of subfamilies Pteridoideae (Kuznetsov, 2014), Cryptogrammoideae (Vaganov, 2016) and Ceratopteridoideae (Vaganov et al, 2017c).…”