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| Hartog, C. den; Plas, F. van der. |
| The family Lemnaceae is divided into 2 subfamilies, Lemnoideae with the genera Spirodela and Lemna — the latter with 2 subgenera, Lemna and Staurogeton — and Wolffioideae with the genera Wolffia, Wolffiopsis, Wolffiella, and Pseudowolffia, the last two being new and based on former infrageneric taxa. All these taxa are described, and their types indicated; keys are provided for their distinction. Recognized species names are listed with their synonyms, a few being newly reduced. There are 5 new specific combinations. A list of invalid and dubious names is added. The excluded names are listed separately. An explanatory glossary is given of the terminology used in the descriptions, and is illustrated by some diagrams (fig. 1). |
| Tipo: Article / Letter to the editor |
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| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/524867 |
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| Plas, F. van der. |
| Monoecious, very rarely dioecious, small to minute aquatic annuals, floating at the surface of the water, or floating just below the surface whereby only a very small part of the frond is exposed to the air, or completely submerged and then rising to the surface in the flowering period. Fronds either solitary or connected in small groups by short to very short hyaline or rarely elongate green stipes (fig. 1 Aa, 1 Ba), symmetric or asymmetric, with reniform, round, linear-lanceolate or angular dorsal outline, green, with or without red or brown pigment cells, sometimes with both types of pigment; base symmetric or asymmetric, obtuse, emarginate or narrowing into the stipe; apex symmetric or asymmetric, round, obtuse or acute; margin entire or slightly... |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/532574 |
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| Hartog, C. den; Plas, F. van der. |
| Two species of Wolffia are known from Australia; these can be easily identified by means of the following key. I. Dorsal side slightly convex; ventral side laterally compressed, with a slight bulge below the budding pouch; width greatest in the dorsal plane.................. 1. W. australiana I. Dorsal side flat near the apex and convex near the base; ventral side globular; width greatest below the dorsal plane at ± half the height....................... 2. W. globosa |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/525464 |
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