| ultrastructural investigation of the spore-forming protist nephridiophaga blattellae in the malpighian tubules of the german cockroach blattella germanica. | multinuclear plasmodia of the sporogenic protist nephridiophaga blattellae are found intracellularly and in the lumen of the malpighian tubules of the german cockroach blattella germanica. spore formation occurs only in the lumen. during sporogony, about 10-35 spores measuring 5.5x3.2 microm are endogenously formed within a plasmodium. sporoblasts arise by the fusion of cisternae of the endoplasmic reticulum into a double membranous wall, which encloses a generative nucleus plus a portion of cyt ... | 1999 | 9951966 |