|
|
|
|
|
| Lange, L. de. |
| A biometrical analysis of preserved specimens of Bufo bufo, supplemented by a detailed examination of the shape of the skin warts, was performed in order to ascertain the taxonomic status of the form described as B.b.spinosus. Indications of a N.-S. clinal variation in the formation of wart thorns and in allometric relations of body elements were found. The validity of the form as a distinct subspecies seems accordingly very doubtful. |
| Tipo: Article / Letter to the editor |
|
| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/504705 |
| |
|
|
| Lange, L. de; Segal, S.. |
| Flat forms of Lemna gibba (fig. 1, a—c) occur rather commonly and differ in several characters from L. minor (fig. 1, d—e), e.g.: The largest diameter of the air cavities below the lower surface of the discs averages 0,19 mm in L. minor, 0,36 mm in flat growth forms of L. gibba and 0,47 mm in swollen growth forms of the latter. In L. gibba the walls of the cavities are thicker than in L. minor. L. minor is usually more convex above and the shape of the discs is more elongate than in L. gibba. L. minor is bright green, L. gibba more greyish green suffused with reddish purple. Pigmentation, if present, starts at the edges of the discs in L. minor and in the centre of the upperside in L. gibba. Discs of L. minor are often found in groups of 5 or more (up to... |
| Tipo: Article / Letter to the editor |
|
| Ano: 1968 |
URL: http://www.repository.naturalis.nl/record/527218 |
| |
|
|
|
