The article discusses the prose poem in literary genetics perspective. The authoress begins with a presentation of research state on the hybrid 'last genre'. Though traditionally regarded as elusive, the prose poem continues to puzzle scholars. Instead of making another attempt to put it into the framework of traditional literary genetics, the authoress refers to the idea of hermeneutic space in which architextual characteristics proves to be more important than paradigmatic of forms. In prose poem, one of such architextual feature is multitude of genres, allowing not only the various literary conventions (lyrical or parody-satirical monologue, short story, symbolic poem, dramatic scene) become real, but also different kinds of speech genres. Openness for modalities previously excluded from poetry seems to be more important than prose poetization, the latter being characteristic of a number of poetical prose varieties.