The Histology of the Phloem in Certain Woody Angiosperms

Abstract

N. S. followed by the age, indicate material taken from a branch of that age on a mature tree. Mature phloem with few exceptions was taken during the dormant season from thrifty trees ten inches or more in diameter. Growing material was also taken from mature trees. Mature root material was obtained from the larger roots of mature trees.

Height‐related scaling of phloem anatomy and the evolution of sieve element end wall types in woody plants

“…Only mature trees that reached the typical maximum height were sampled. The procedure for sampling and analysis resembles the procedure followed in previous investigations of SE end wall anatomy (MacDaniels, ; Esau & Cheadle, ; Pace et al ., ). A 1 × 2 cm piece of bark was cut from the stem at breast height (1.3 m) using a sharp knife, immediately fixed in 70% formalin‐acetic acid alcohol (Berlyn & Miksche, ) and subsequently stored in 70% ethanol.…”

“…Comparative studies of SE end wall anatomy in a wide range of species have been conducted and, based on their results, different end wall types have been defined (Fig. ; MacDaniels, ; Esau & Cheadle, ; Zahur, ). One type refers to transverse‐oriented end walls that are covered by a single sieve area.…”

The Arborescent Habit in Angiosperms

“…These studies are concerned in general with wood structures. Hemenway's anatomical studies of the phloem of Dicotyledons are also held to support the theory of the derivation of herbs from woody plants (64); the ph3dogenetic value of Hemenway's work has, however, been questioned by MacDaniels (108), the range of forms studied not having been sufficiently wide.…”

Stem Anatomy and Phylogeny of the Rhoipteleaceae

“…The phloem is very much like that of the J uglandaceae as it is described by Hemenway (1911) and MacDaniels (1918). The sieve-tube elements are type I under Hemenway's (1913) classification.…”