单语范例（未经PONS编辑处理）
英语
- The germ tube develops into the hypha, protonema or thallus of the gametophyte.en.wikipedia.org
- Protonema filaments grow exclusively by tip growth of their apical cells and can originate side branches from subapical cells.en.wikipedia.org
- As stems grow, they develop their own rhizoids and become independent of the protonema.en.wikipedia.org
- In either case, the protonema is a transitory stage in the life of a hornwort.en.wikipedia.org
- It is the adult form of the haploid gametophyte and develops from the juvenile form, the protonema, under the influence of phytohormones (mainly cytokinins).en.wikipedia.org
- Rhizoids grow down from the protonema and penetrate the substrate.en.wikipedia.org
- From the protonema grows the adult gametophyte, which is the persistent and independent stage in the life cycle.en.wikipedia.org
- Stems arise from buds that develop on the protonema surface.en.wikipedia.org
- A germinated spore develops into a protonema (a branched, threadlike structure).en.wikipedia.org
- The initial phase of growth leads to a filament of cells (called the protonema).en.wikipedia.org
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