Peristome development

Shaw, J. and Anderson, L. E. (1988) Peristome development in mosses in relation to systematics and evolution, n. Tetraphis pellucida (Tetraphidaceae). American Journal of Botany, 75 1019-1032. 

Archegonium developing a calyptra mostly with an operculum and peristome, but some cleistocarpous sporangium with a... 

Peristome teeth thin, developed in the amphithecium and derived from the cell walls of a single layer of cells, always transversely barred sometimes entirely wanting. 

Peristome distinctly double and the endostome usually well developed, except in astomous groups. 

Endostome processes opposite the teeth of the exostome, either free or united with them, but the peristome sometimes entirely wanting hypophysis sometimes highly developed acrocarpous mosses.Order Splachnales (Funariales)... 

Peristome teeth solid, rarely absent, developed from two or more tissue layers of the sporangium, not transversely barred or... 

After almost 2 years, he developed severe pruritus and squamous erythematous plaques in the peristomal skin. Patch tests were positive with the lubricant ointment and one of its constituents, tetracaine. 

Howard Crum (Figure 1.10) and I (Buck and Crum, 1990) relied totally on gametophytic characters in defining familial boundaries of the Leskeaceae/Thuidiaceae complex even though traditionally the families were separated on sporophytic differences (sometimes even into different orders). We allowed, within a single family, sporophytic evolution in which fnlly developed hypnoid peristomes can become greatly reduced. We correlated these reduction seqnences with differences in habitat. 

The diplolepidous peristome is formed from cells in the three innermost layers of the amphithecium of the developing capsule (Figure 12.1). The three layers forming the peristome were named by Blomquist and Robertson (1941) as ... 

FIGURE 12.1 Diagram of a transverse section through the developing capsule of Entodon in the region of the peristome showing the relationship of the OPL, PPL and IPL to the exostome and endostome. 

Blomquist, H. L. and Robertson, L. L. (1941) The development of the peristome in Aulacomnium heterosti-chum. Bulletin of the Torrey Botanical Club, 68 569-584. 

Schnepf, E., Stein, U. and Deichgraher, G. (1978) Structure, function and development of the peristome of the moss, Racopilum tomentosum, with special reference to the problem of microfibril orientation by... 

Shaw, J. and Robinson, H. (1984) On the development, evolution, and function of peristomes in mosses. 

On the grape surface, there are between 25 and 40 stomata per berry, depending on the variety. After veraison, these stomata no longer function and they necrotize. Rapid fruit enlargement creates tension, resulting in the development of peristom-atic microfissures. 

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