Prochloron is a genus of prokaryotic algae with photosynthetic pigments like those of chlorophytes. Prochlorophytes are almost invariably found associated as symbionts with marine protochordates (didemnid ascidians), and so far none has been successfully grown in sustained culture away from in host. Based on materials collected from nature, information of various sorts (biochemical, physiological, cytological and fine-structural) has been obtained, indicating many resemblances (and probably close phylogenetic affinities) between prochlorophytes and cyanophytes. Nevertheless they are distinguished by certain unique combinations of characters. Some of the data support the symbiogenesis theory for the origin of green-plant chloroplasts. Other possibilities are briefly discussed.

中文翻译：

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Prochloron — 状态报告

Prochloron 是一种原核藻类，具有光合色素，如叶绿素。原叶绿藻几乎总是被发现与海洋原脊索动物（didemnid ascidians）共生，到目前为止，还没有在远离宿主的持续培养中成功生长。基于从自然界收集的材料，已经获得了各种（生化、生理、细胞学和精细结构）的信息，表明原叶绿植物和蓝藻植物之间有许多相似之处（可能还有密切的系统发育亲缘关系）。然而，它们的区别在于某些独特的字符组合。一些数据支持绿色植物叶绿体起源的共生理论。简要讨论了其他可能性。