INTRODUCTION 199 THE ANGIOSPERMOUS SIEVE-TUBE MEMBER ... ..... ... ..... .. ... ... 201 The Protopla s t .. .. ....... ....... ..... ....... ... ......... ... ...... ... ..... ... ....... ... ..... ..... ... ... ... 201 Nucleus ... .. . ...... . 201 Endoplasmic reticulum 202 Plastids ..... .. ... .. 202 Mitochondria 203 Plasmalemma and tonoplast ...... 203 P-protein .. .. .. . .. 204 The Wall .. ........ ......... ....... ..... ....... ..... ... ... ...... ..... ....... ....... ... ......... 207 The Sieve Plate .. ... ..... ...... ....... ..... ......... ....... ..... ...... 208
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Ray F. Evert (1977) studied this question.