. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M ^) i Figure 5. (A) Fusion of mat and stolonal tissues hours after initial contact between colonies (1390X). Arrow points to region of initial contact. Note the lack of any distinct boundary separating cells of the two colonies. (B) Rejection between mats of two allogeneic colonies (1200X). Lying between the two colonies, along the entire length of boundary, is an electron-dense fibrous material. This fibrous layer, shown at higher magnification (8040X) in (C), is not in contact with the tissues of either colony. M = ma
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. M ^) i Figure 5. (A) Fusion of mat and stolonal tissues hours after initial contact between colonies (1390X). Arrow points to region of initial contact. Note the lack of any distinct boundary separating cells of the two colonies. (B) Rejection between mats of two allogeneic colonies (1200X). Lying between the two colonies, along the entire length of boundary, is an electron-dense fibrous material. This fibrous layer, shown at higher magnification (8040X) in (C), is not in contact with the tissues of either colony. M = mat, S = stolon. isogeneic and allogeneic tissues; (3) respond by site-specific cellular differentiation; and (4) involve the discharge of nematocysts to effect destruction of foreign tissues. Recognition elements Anthozoan responses to foreign tissues are apparently elicited by contact with either the tentacles, coenosarcs, or mesenterial filaments of other cnidarians. In H. echinata, the response is elicited following contact with either mat or stolonal tissue. Cnidarians are typically covered with a copious mucous layer, perforated with mi- crovillar extensions of ectodermal cells. Tardent and Buhrer (1982) suggest that rec-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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