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A ROUTE FOR THE PASSAGE OF SUBSTANCES THROUGH THE DEVELOPING PTERIDOPHYTE EXINE = VOIE DE PASSAGE POUR LES SUBSTANCES A TRAVERS L'EXINE EN DEVELOPPEMENT DES PTERIDOPHYTESPETTITT JM.1976; PROTOPLASMA; OESTERR.; DA. 1976; VOL. 88; NO 1; PP. 117-131; BIBL. 1 P. 1/2Article

A LOWER CARBONIFEROUS SEED COMPRESSION FROM NORTH WALESPETTITT JM; LACEY WS.1972; REV. PALAEOBOT. PALYNOL.; NETHERL. ; 1972, VOL. 14, NUM. 0001-0002, P. 159 A 169Serial Issue

POLLEN IN HYDROPHILOUS ANGIOSPERMSPETTITT JM; JERMY AC.1974; MICRON; G.B.; DA. 1974; VOL. 5; NO 4; PP. 377-405; ABS. FR. ALLEM.; BIBL. 1P.Article

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ARCHAEOSPERMA ARNOLDII -A CUPULATE SEED FROM THE UPPER DEVONIAN OF NORTH AMERICA.PETTITT JM; BECK CB.1968; CONTRIB. MUS. PALEONTOL., UNIV. MICHIGAN; USA; 1968(11), VOL. 22, NUM. 0010, P. 139 A 154Miscellaneous

ORGANIZATION OF THE WALL LAYERS OF THE STIGMATIC PAPILLAE OF GLADIOLUS GANDAVENSIS: A FREEZE-FRACTURE STUDYCLARKE AE; ABBOT A; MANDEL TE et al.1980; J. ULTRASTRUCT. RES.; ISSN 0022-5320; USA; DA. 1980; VOL. 73; NO 3; PP. 269-281; BIBL. 23 REF.Article

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