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  • 1
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    Blyxa Quadricostata nov. sp., a new Hydrocharitacea from Thailand (1973)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 21 no. 1, pp. 185-187
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    Publication Date: 2024-01-12
    Description: The dioecious species of the genus Blyxa can be divided into 2 groups, those with 6 stamens and those with 9 stamens in the male flowers. The first group is restricted to tropical Africa and needs further study. The second group occurs in Asia and Australia and up to now was considered to consist of 2 very distinct species, Blyxa octandra (Roxb.) Planch, ex Thw., characterized by a basal rosette of long, smooth, linear leaves, and B. novoguineensis den Hartog which is caulescent with short serrulate leaves. B. octandra is widely distributed in India, Burma, Indo-China, New Guinea, and the tropical part of Australia. B. novoguineensis is known with certainty only from New Guinea. Recently a third species, very similar in its habit to B. octandra, was found by Dr. C. F. van Beusekom and Mr. R. Geesink in Thailand. From a study of herbarium material it appeared that this species had already been collected several times but had not been recognized as a separate species, probably because of the absence of seeds in these plants.
    Repository Name: National Museum of Natural History, Netherlands
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  • 2
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    A synopsis of the Lemnaceae (1970)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 18 no. 2, pp. 355-368
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    Publication Date: 2024-01-12
    Description: The family Lemnaceae is divided into 2 subfamilies, Lemnoideae with the genera Spirodela and Lemna \xe2\x80\x94 the latter with 2 subgenera, Lemna and Staurogeton \xe2\x80\x94 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).
    Repository Name: National Museum of Natural History, Netherlands
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  • 3
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    Review (1967)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 15 no. 2, pp. 544-544
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    Publication Date: 2024-01-12
    Description: In the eyes of most aquarists plants have merely a decorative function in the aquarium. Several aquarists, however, have made the plants the subject of their special interest, and it is for these people that Professor De Wit actually wrote his book. In order to make it easier for them he has not followed the usual systematic arrangement of the species but has arranged the species according to their habit. The following growthforms are dealt with successively: 1. Plants freely floating on the surface; 2. Submerged but freely floating plants; 3. Rooting plants with rosettes of filiform, linear, or ribbon-shaped leaves; 4. Plants with leaf-rosettes on the bottom; 5. Rooting plants with floating leaves; 6. Plants with creeping stems and erect leaves; and 7. Plants with erect leaf-bearing stems.\nThere are, however, many species that can be classified in more than one of these vague categories, e.g. Elisma natans, Potamogeton octandrus, many species of Sagittaria and Echinodorus, and all Ceratophyllum species. Two species, Wolffiella floridana and Riccia fluitans, are erroneously classified as plants floating on the surface; they are submerged pleustophytes.
    Repository Name: National Museum of Natural History, Netherlands
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  • 4
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    Some notes on the distribution of Plasmodiophora diplantherae, a parasitic fungus on species of Halodule (1965)
    In:  Persoonia - Molecular Phylogeny and Evolution of Fungi vol. 4 no. 1, pp. 15-18
    Details
    Publication Date: 2024-01-12
    Description: Plasmodiophora diplantherae (F. & W.) Iv. Cook is a specific parasite on species of the sea-grass genus Halodule. It had been recorded only from its type locality in the West Indies, but from a recent study of extensive herbarium material it has proved to be a widely distributed pantropic species.
    Repository Name: National Museum of Natural History, Netherlands
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  • 5
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    Plasmodiophora bicaudata, een parasiet op Zostera noltii (1973)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 6 no. 7, pp. 121-123
    Details
    Publication Date: 2024-01-12
    Description: The parasitic fungus Plasmodiophora bicaudata, which prevents the elongation of the internodes of Zostera noltii and gives the diseased plants a tufted appearance, has been found in three localities in the Netherlands but is obviously very rare.
    Repository Name: National Museum of Natural History, Netherlands
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  • 6
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    Fycologische Notities, 1, Sphacelaria plumigera in Zeeland (1962)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 1 no. 8, pp. 81-84
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    Publication Date: 2024-01-12
    Description: Sphacelaria plumigera Holmes is reported from 8 localities in the province of Zeeland (Netherlands). The differences between this species and S. plumosa Lyngb., with which it has been confounded, are given, and its habitat is described. The species occurs in the upper part of the sublittoral and the lowest part of the eulittoral, and is uncovered only during the spring ebb. It shows a preference for sheltered localities and has been found in the following algal communities: Polysiphonieto-Chaetomorphetum, Codieto-Hypoglossetum, and in the vegetation of Laminaria saccharina. The species is limited to the euhalinicum and does not occur in the brackish waters of the estuaries. Unilocular sporangia have been found in February, March and April. Finally the geographic distribution of the species is recorded.
    Repository Name: National Museum of Natural History, Netherlands
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  • 7
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    Crassula helmsii (Kirk) Cockayne, een adventief op droogvallende, zandige oevers (1996)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 22 no. 6, pp. 149-152
    Details
    Publication Date: 2024-01-12
    Description: Crassula helmsii, an amphibious species originating from temperate Australia and New Zealand, is recorded for the first time from the Netherlands. In 1995 and 1996 it has been found in a nature reserve near Breda. The authors suggest that it should be destroyed there in order to prevent that it becomes an invasive weed.
    Repository Name: National Museum of Natural History, Netherlands
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  • 8
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    De Nederlandse Ruppia-soorten (1971)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 5 no. 7/10, pp. 148-153
    Details
    Publication Date: 2024-01-12
    Description: The genus Ruppia is represented in the Netherlands by two species, R. maritima L. and R. cirrhosu (Petagna) Grande. These species differ not only in morphological and cytogenetical characters, but they also show differences in flowering biology, life-cycle, ecology and geographical distribution.
    Repository Name: National Museum of Natural History, Netherlands
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  • 9
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    Tetramyxa parasitica, een gal op Ruppia (1963)
    In:  Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland vol. 1 no. 12, pp. 138-140
    Details
    Publication Date: 2024-01-12
    Description: Tetramyxa parasitica Goebel, a Plasmodiophoracean parasite, has been found on Ruppia spiralis L. ex Dum. in three places in the south-western part of the Netherlands, viz. in the Flaauwersinlaag and in the Weversinlaag on the island of Schouwen and in the \xe2\x80\x9einlaag\xe2\x80\x9d near the Torenpolder on the island of Noord-Beveland. The parasite forms more or less spherical galls on the stems (fig. 1, b), the leaves and even on the inflorescences (fig. 1, a) of the host. The galls seem to be formed only under special ecological conditions. Although the localities on Schouwen were visited every month since June 1959 the galls were only found for the first time in 1962. Salinity may perhaps be a factor involved in the sporadic appearance of these galls. In 1962 the maximum salinity in the ponds was below 10\xe2\x80\xb0 Cl\xe2\x80\x99; in the preceding years it was considerably higher.
    Repository Name: National Museum of Natural History, Netherlands
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  • 10
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    Review (1967)
    In:  Blumea: Biodiversity, Evolution and Biogeography of Plants vol. 15 no. 2, pp. 575-576
    Details
    Publication Date: 2024-01-12
    Description: There has not been an extensive taxonomical treatment of the Lemnaceae since the publication of the famous works of Hegelmaier (1868, 1895). As the quantity of preserved and dried material of this family has increased considerably since Hegelmaier\xe2\x80\x99s time, and as some new species have been described and the flowers and fruits of some other species have become known, there is, according to Daubs, a \xe2\x80\x99need for a critical review of the family in the light of this later knowledge, as well as some synthesis of the widely scattered data into a more readily available form\xe2\x80\x99.\nI have used this revision and it must at once be praised for the clear and adequate descriptions of the taxa and the excellent, accurate drawings.
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