An ultrastructural study of the relationship between the mite Floracarus perrepae Knihinicki & Boczek (Acariformes : Eriophyidae) and the fern Lygodium microphyllum (Lygodiaceae)

The ultrastructure of the mite Floracarus perrepae was investigated in relation to its host, Lygodium microphyllum, the Old World climbing fern. Floracarus perrepae has been suggested as a means of biological control for the fern, which is an aggressive weed in tropical areas. Feeding by the mite induces a change in the size of epidermal cells, and cell division is stimulated by mite feeding, causing the leaf margin to curl over into a roll with two to three windings. The enlarged epidermal layer greatly increases its cytoplasmic contents, which become a nutritive tissue for the mite and its progeny. Damage by the mite ultimately debilitates the fern. The structure and depth of stylet penetration by the mite, and the thickness of the epidermal cell wall of L. microphyllum, do not appear to account for the mite's differential ability to induce leaf rolling in its co-adapted host from south-east Queensland but not in the invasive genotype of the fern in Florida. F

Supplementum Tentaminis pteridographiae, continens genera et species ordinum dictorum Marattiaceae, Ophioglossaceae, Osmundaceae, Schizaeaceae et Lygodiaceae.

"Ex Actis Societatis Regiae Bohemicae Scientiarium. (Series V. Volumen IV.)"

中国蕨类植物孢子形态的研究Ⅰ.海金沙科

此文是中国蕨类植物孢子形态研究的第一部分。首次利用扫描电镜对国产海金沙科Lygodiaceae海金沙属Lygodium 1 0种植物的孢子形态进行了观察 ,并利用透射电镜对孢壁的结构进行了研究。此外 ,还对采自国外的另外 1 0种海金沙属植物的孢子进行了比较观察。海金沙属孢子为三裂缝 ,少数为单裂缝 ,其表面纹饰可分为 4种类型 :①瘤状纹饰 ,海金沙属多数种类的孢子具此类型 ;②表面平滑 ,L .palmatum、L .subareolatum、L .yunnanense、L.volubile等属此类型 ;③疣状纹饰 ,L.dimorphum、L.digita tum、L .kingii等属此类型 ;④网穴状纹饰 ,L .scandens,L .reticulatum等属此类型。网状纹饰类型的孢子表面轮廓是由外壁形成 ,其余类型的孢子表面轮廓由周壁形成。此文还对海金沙属的孢子特征及其在分类上的意义进行了探讨

Biology and phenology of the eriophyid mite, Floracarus perrepae, on its native host in Australia, Old World climbing fern, Lygodium microphyllum

The biology and phenology of the eriophyid mite, Floracarus perrepae Knihinicki and Boczek,a potential biological control agent of Lygodium microphyllum (Cav.) R. Br., was studied in its native range - Queensland, Australia. F. perrepae forms leaf roll galls oil tile subpinnae of L. microphyllum. It has a simple biology, with females and males produced throughout the year. Tile Population was female biased at 10.5 to 1. The immature development time was 8.9 ± 0.1 and 7.0 ± 0.1 days; adult longevity was 30.6 ± 1.6 and 19.4 ± 1.2 days and mean fecundity per female was 54.5 ± 3.2 and 38.5 ± 1.6 eggs at 21 and 26 ° C, all respectively. Field studies showed that tile mite was active year round, with populations peaking when temperatures were cool and soil moisture levels were highest. Two species of predatory mites, Tarsonemus sp. and a species of Tydeidae, along with the pathogen Hirsutella thompsonii, had significant effects oil all life stages of F. perrepae. Despite high levels of predators and the pathogen, F. perrepae caused consistent damage to L. microphyllum at all the field sites over the entire 2 years of the study.