Studies in Oberonia, 9: Lessons from excess names in Oberonia for Orchidaceae systematics, including a revision of the Oberonia Sect. Scytoxiphium

Lankesteriana ◽

10.15517/lank.v21i2.47245 ◽

2021 ◽

Author(s):

Daniel L. Geiger

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Electron Micrographs ◽

21St Century ◽

Expert Advice ◽

Scanning Electron Micrographs ◽

Palabras Clave ◽

Microscope Images ◽

Typological Thinking ◽

Scanning Electron

The reasons for excess names in microfloral orchids such as Oberonia Lindl. can be traced to poor scholarship (e.g., failure to review the literature, ignoring expert advice), typological thinking, and erroneous assumption of microendemism. Some extraordinarily poor descriptions, including some from the 21st century, can be termed “taxonomic vandalism”. The outdated reliance on drawings as opposed to z-stacked photographs and scanning electron micrographs poses further problems due to an abundance of demonstrable problems with drawings. The Oberonia sect. Scytoxiphium Schltr. with eight described species is reduced to one species, Oberonia heliophila Rchb.f.; it is illustrated by original drawings, live photographs and scanning electron microscope images. The distribution is extended from Java through Micronesia and Samoa. The species occurs predominantly from 0–500 m, less frequently to 900 m, and possibly to even 1900 m. It flowers throughout the year. Keywords/Palabras clave: Oberonia, Oberonia sect. Scytoxiphium, revision, revisión, synonymies, sinonimias, taxonomic vandalism, vandalismo taxonómico

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Cell walls in Cucurbita maxima cotyledons in relation to imbibition

Canadian Journal of Botany ◽

10.1139/b74-192 ◽

1974 ◽

Vol 52 (7) ◽

pp. 1465-1468 ◽

Cited By ~ 8

Author(s):

John N. A. Lott

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Electron Micrographs ◽

Propylene Oxide ◽

Cell Walls ◽

Scanning Electron Micrographs ◽

Cucurbita Maxima ◽

Glutaraldehyde Fixation ◽

Mesophyll Cells ◽

Scanning Electron

The scanning electron microscope and the freeze-etch technique were used to demonstrate the presence of corrugated cell walls in cotyledon mesophyll cells from dry squash seeds. These wavy cell walls straightened out during imbibition. In the scanning electron micrographs no wavy cell walls were observed in the smaller epidermal cells. Tissue imbibed for 2 h and then air-dried contained corrugated cell walls, whereas similar imbibed tissue dehydrated in ethanol and propylene oxide contained smooth cell walls. Thus the method of seed dehydration is important in determining the appearance of wavy cell walls. Glutaraldehyde fixation during the 2-h imbibition process did not alter the conditions under which wavy cell walls reappear.

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An SEM study of the cephalic region, buccal cavity and male tail of the species of the genus Strongylus Müller, 1780 (Nematoda, Strongyloidea)

Journal of Helminthology ◽

10.1017/s0022149x00028686 ◽

1984 ◽

Vol 58 (2) ◽

pp. 149-158 ◽

Cited By ~ 2

Author(s):

Lynda M. Gibbons

Keyword(s):

Electron Microscope ◽

Scanning Electron Microscope ◽

Electron Micrographs ◽

Buccal Cavity ◽

Scanning Electron Micrographs ◽

Specific Identification ◽

Male Tail ◽

Genital Cone ◽

Sem Study ◽

Scanning Electron

AbstractThe four species of the genus Strongylus Müller, 1780, namely, S. equinus, S. edentatus, S. vulgaris and S. asini were examined with the scanning electron microscope (SEM). The buccal cavity of each species was cut transversely and longitudinally and the scanning electron micrographs illustrate the shape of the buccal cavity and the dorsal gutter. The micrographs also show the presence of denticles near the oral rim of the buccal cavity of S. edentatus and the shape of the teeth in the buccal cavity of S. equinus, S. vulgaris and S. asini. The bursa of the four species has three symmetrical lobes, one dorsal and two lateral. The length of the three lobes in relation to each other varies between the species. The genital cone has a single large ventral papilla, a pair of dorsal raylets, a median dorsal cuticular appendage and a variety of cuticular appendages lateral and ventral to the cloaca. The development and arrangement of these components differs between the four species of the genus and can be used as a supportive character for specific identification.

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