Succulenta December 2023

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Index: Auteurs Bregman, Rob 38, 47, 95, 143, 191, 243, 291 Delabarre, Freddy 136, 282 Diers, Lothar en Jucker, Hansjörg Groot, Henk de 178 Heijnsdijk, Theo 3, 51, 99, 147, 166, 195, 247 Hoeve, Wolter ten 25, 41, 90, 139, 187, 241, 284 Knippels, Peter 16, 66, 121, 169, 233 Maessen, Riet 60 Oome, Stan 182 Rengelink, Theo 138 Romijn, Petra 11 Ruinaard, Henk 73, 158, 212, 221, 257 Smit, Ton 117 Somers, Nadet 22, 134, 174, 208 Spee, Bertus 14, 58, 110, 156, 206, 262 Talens, Aiko 112, 268 Tran, Ðoan 218, 278 Tropper, Ruud 162, 264, 265 Twijnstra, Tom 48, 96, 144, 192, 244, 292 Wijffelaars, Ben 2, 50, 98, 146, 194, 246 Zuijlen, Andre van 226, 238 81 Hildewintera (in bloei) 180 Jatropha mahafalensis 63 Kalanchoe daigremontiana 177 Kalanchoe pinnata 174 Lithops lesliei 144 Lithops otzeniana 279 Lobivia ferox 119 Lobivia grandiflora subsp. minuta 120 Mammillaria dioica 184 Mammillaria kruegeri 30 Mammillaria lasiacantha 164 Mammillaria laui 26 Mammillaria melanocentra 228 Mammillaria plumosa 229, 230, 231 Mammillaria sartorii 29 Mammillaria sonorensis 270 Mammillaria weingartsiana 34 Melocactus azureus HU 256 128 Melocactus glaucescens HU 219 129 Melocactus harlowii subsp. borhidii 59 Melocactus neryi 125 Melocactus pachyacantus HU 407 97 Melocactus pachyacantus HU 407a 131 Melocactus schulzianus 124 Mila caespitosa 207 Monvillea spegazzinii 157 Neochilenia napina 120 Opuntia (afwijking) 181 Opuntia (in sneeuw) 161 Opuntia (vruchten) 180 Opuntia species 30 Pachypodium geayi 62 Pachypodium lamerei 72 Parodia acchillensis HJ 1234 81, 82, 84 Parodia acchillensis HJ 1235 86 Parodia acchillensis 86 Parodia subterranea WR 634 88 Pilocereus strausii 52 Portulacaria afra variegata 210 Punotia lagopus 159 Pyrrhocactus umadeave 157 Rhipsalis species 292 Scadoxus cinnabarinus 68 Soehrensia formosa 238, 240 Strombocactus disciformis 275 Thelocactus lophothele subsp. rinconensis 227 Thelocactus tulensis 111 Turbinicarpus lophophoroides 111 Uncarina grandidieri 70 Welwitschia mirabilis 17, 19, 20 Woestijnlupine 186 Yucca (in sneeuw) 161 Yucca filamentosa 244 290 Succulenta jaargang 102 (6) 2023
Summary Rob Bregman In this last 2023 issue we focus on sowing. This popular element of our hobby is covered by contributions of four authors who describe their methods, everyone with his/her own ‘personal touch’. But first of all, Ben Wijffelaars tries to promote the genus Aeonium, also on facebook. His A. arboreum had grown too large to take it out of his greenhouse. In his series on the ‘Verkade’ handbooks published in the early 1930s Theo Heijnsdijk discusses Hamatocactus setispinus. This well-known cactus was collected for the first time in 1844 at the Colorado River bank in Texas by the German Ferdinand Lindheimer. A year later it was described as Echinocactus setispinus. In 1850 Georg Engelmann described 2 varieties: var. hamatus and var. setaceus. In 1922 the new genus Hamatocactus was introduced for this plant by Britton and Rose because of differences in spination, fruit and seed. Later, it was placed in Ferocactus (Benson, 1969) and Thelocactus (Anderson, 1987). Moreover, some authors created a taxonomic chaos by placing several more or less similar plants in different genera (with new names). A remarkable feature of H. setispinus is the presence of nectar glands just above each areole, This is considered to attract ants which protect the plant against small sap sucking animals. Cultivation is easy; flowers often appear all summer long. Henk Ruinaard examined the effect of Superol (a disinfectant) on the germination of cactus seeds. He used 4 samples of 100 Echinocereus hybrids seeds, which were placed on sheets wetted with different concentrations of Superol (50 to 500 mg/l) in water. Germination percentages in 0-150 mg/l Superol were around 60 %, but higher concentrations yielded worse results, with no germination at all in solutions above 500 mg/l. Anyway, Henk’s conclusion is that a positive effect of Superol on germination remains doubtful. Succulenta jaargang 102 (6) 2023 Bertus Spee presents part 130 of his series ‘In the spotlight’. Four nice succulents (Aeonium arboreum var. atropurpureum, Gasteria brevifolia, Grusonia invicta and Gymnocalycium mihanovichii) are shown and briefly discussed. Ruud Tropper outlines his method how to sow cactus seeds. He uses plastic boxes with vermiculite as substrate. In a second contribution, Ruud goes deeper into his method of sowing cacti, with details on sowing seeds of Sclerocactus, Pediocactus and Toumeya. He prepares these hard seeds by removing the hilar section (‘chipping’). Aiko Talens has adopted another method to sow cactus seeds. He uses loam as substrate and sows in April, in his greenhouse, without heating. A list of international seed suppliers is included. Đoan Tran is still trying to find out the most successful method for sowing her mesemb seeds. A 25 % organic substrate and sufficient water gave the best results. Freddy Delabarre acquired the archives of E.T. Claeys, a Belgian cactus lover and former chairman of a regional section of Succulenta. This included certificates and photos of plant expositions in 1933 and 1935. Wolter ten Hoeve gives his usual summary of the most important articles in foreign journals on succulent plants, this time ‘Kakteen und andere Sukkulenten’ and ‘Cactus World’. As usual at the end of the year, all plant and author names in the 2023 Succulenta volume are listed alphabetically. Tom Twijnstra reports about an unknown rhipsalis in his holiday bungalow. The cutting he took was doing well hanging from a tree in his garden. R.Bregman@contact.uva.nl 291
Page 1 and 2: 6 December 2023 Jaargang 102 ISSN 0
Page 3 and 4: Hamatocactus setispinus De borstel-
Page 5 and 6: ook politiek actief. In 1834 vertro
Page 7 and 8: van Echinocactus setispinus werd nu
Page 9 and 10: kwam de Amerikaanse botanicus Ivan
Page 11 and 12: Ik vind ze ook bij E. Setispinus, E
Page 13 and 14: Invloed van Superol op het kiemperc
Page 15 and 16: kleine verschillen met de eerdere p
Page 17 and 18: Tabel 4 Nr. Zaadnr. Soort Kiemperce
Page 19 and 20: Grusonia invicta Deze plant is afko
Page 21 and 22: Er is natuurlijk wel wat licht nodi
Page 23 and 24: 2017). Hierin wordt Sclerocactus we
Page 25 and 26: Daarvoor wacht ik wel de juiste tij
Page 27 and 28: Het zaaien zelf Zaden zitten vaak v
Page 29 and 30: week later volledig droog zijn, kri
Page 31 and 32: ven. Op een gegeven moment kan er w
Page 33 and 34: Köhres (Duitsland), www.kaktus-koe
Page 35 and 36: organisch materiaal: gezeefde potgr
Page 37 and 38: De kwaliteit van het zaad bepaalt i
Page 39 and 40: Opstellingen bij een tentoonstellin
Page 41 and 42: in 1886 onder de naam Pilocereus pa
Page 43 and 44: Index jaargang 102 (2023): Artikele
Page 45: Cylindropuntia bigelovii 145 Cyrtan

Succulenta December 2023

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