Elementary botany . Fig. 184. A red alga (Callithamnion), showing spor-angium A, and the tetraspores dischargedB. (After Thuret.). Fig. , portion of frond,showing position of cystocarps. Fig. , section of cysto-carp showing spores. donia, Gracilaria, etc., it is imbedded in the cortex. In Batrachosperthere are monosporangia, each monosporangium containing a singkdium, while in Lemanea, and according to some also in Nemalion,are wanting. 174 MORPHOLOGY. 377. Gracilaria.—Gracilaria is one of the marine forms, and one speciesis illustrated in fig. 185. It measures 15-20
Elementary botany . Fig. 184. A red alga (Callithamnion), showing spor-angium A, and the tetraspores dischargedB. (After Thuret.). Fig. , portion of frond,showing position of cystocarps. Fig. , section of cysto-carp showing spores. donia, Gracilaria, etc., it is imbedded in the cortex. In Batrachosperthere are monosporangia, each monosporangium containing a singkdium, while in Lemanea, and according to some also in Nemalion,are wanting. 174 MORPHOLOGY. 377. Gracilaria.—Gracilaria is one of the marine forms, and one speciesis illustrated in fig. 185. It measures 15-20CW or more long, and is pro-fusely branched in a palmate manner. The parts of the thallus are moreor less flattened. The fruit is a cystocarp, which is characteristic of theRhodophyceae (Florideae). In Gracilaria these fruit bodies occur scat-tered over the thallus. They are somewhat flask-shaped, are partly sunkin the thallus, and the umical end projects strongly above the surface. Thecarpospores are grouped in radiating threads within the oval cavity of thecystocarp. These cystocarps are developed as a result of fertiliz
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