457 



Micrography of the wood of Aptiana radiala, 

 M. C. S tope s, Phil. Tnms. Ser. B vol. 203, p. 75. 



A stem or brandi thick about 3,5 cm. 



T p g r il p h y. 



A)mual, rings structurally recognisable '), the limit of 

 aome of the rings a little difficult to détermine; thick 

 about 0,6 mm. (p. 85). The niimher of vessels and thcir 

 transverse dimensions, also the cavities of the fibre-tracheids 

 in the inner part of the annual ring larger than in the 

 oiiter ; the hrcadth of medidlary rays sometimes snudler in 

 the inner imrt of the ring. Vessels for the rest uniforndij 

 distributed; with a few exceptions isolated and standing 

 separated from each other in the radial rows of fibre- 

 tracheids (Plate 6 Photo 4, Plate 7 Photo 6, Plate 8 Photo 10 

 and text-flg. 1); in one or two cases 2 vessels standing 

 adjacent in the tangential direction, but such pairs are 

 rare (p. 85) and disturb remarkably little the radial rows 

 of the fibre-tracheids (p. 86). Fibre-tracheids: the wood ap- 

 pearing to be entirely composed of fibre-tracheids; arranged 

 with considérable regularity in radial rows (p. 86). Wood 

 parenchyma scarce and possibly wanting; several times 

 lying just behind vessels, spanning the distance between 

 the rays (text-fig. 1 and p. 86). Medidlary rays '^) in 2 kinds. 



1) On p. 85 is added: , but not clearly markcd by any noticcablc 

 change in the character of the wood or sizc of the vessels." By 

 studying Pi. 6 Photo 4 and PI. 7 Photo 6 we hâve comc to an 

 opposite opinion, to that mentioned in the toxt. 



2) A character, dcscribcd by Mrs. S topes (p. 87j as a noticc- 

 able feature, is the way of dying out or dwindling down to 1 ccll 

 thick in transverse section of the broader rays (PI. 6 Photo 3 and 4 

 dm and tcxt lig. 4). The authorcss says hcrdelf: „whilc it is vcry 



