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SPOROPHYTE DEVELOPMENT IN THE MOSS ECCREMIDIUM FLORIDANUM CRUM (DITRICHACEAE, MUSCI)

by Clark, John R

Abstract (Summary)
Eccremidium floridanum Crum (Ditrichaceae) is described as a structurally reduced, ephemeral moss related to Pleuridium Rabenh. (Ditrichaceae). Ontogetic study of sporophyte development in Eccremidium floridanum Crum (Ditrichaceae) was conducted to ascertain development patterns for comparison with members of the subclass Bryideae. Observations in ontogeny indicate sporophytes of Eccremidium floridanum follow the typical Bryidean-type development up to the three-layered amphithecial stage. Following formation of the third amphithecial layer, development in E. floridanum differs from development reported in other mosses. Differential cell swelling and expansion distort demarcation of the fundamental tissues at the annular level. A line of dehiscence develops from exothecial cells at the sporogenous level. This structure differs from a true annulus that develops from exothecial cells at the annular level in other mosses.
Bibliographical Information:

Advisor:

School:University of Cincinnati

School Location:USA - Ohio

Source Type:Master's Thesis

Keywords:bryophyte sporophyte development phylogeny systematics evolutionary reduction evolution

ISBN:

Date of Publication:01/01/2001

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