482 
Anatomie. — Morphologie, Befruchtung, etc. 
Die Spaltöffnungen, ausschliesslich auf der Blattunterseite, sind 
in die Epidermis eingesenkt und sehr zahlreich. 
Die Trichomentwicklung ist bei den verschiedenen Arten sehr 
verschieden. Neben völlig kahlen Blättern finden sich Arten mit 
reichlicher Behaarung. Die Haarform kann ein Charakteristikum 
für die Art angeben. 
Kristallablagerungen finden sich bei allen Arten , meist in stern¬ 
förmigen Drusen. _ F. Gericke (Halle). 
Quava, C. Contributions ä Tanatomie des M onocotyledonees. 
II. Les Uvulartees rhizomateuses. (Beihefte Bot. Centrbl. XXII. 
1. p. 30-77. 1907.) 
Verf. behandelt von den rhizomtragenden Uvular ieen die ameri¬ 
kanische Gattung Uvulavia und die asiatische Tricyrtis. Ein Ver¬ 
gleich beider Gattungen zeigt, dass die Gattung Tricyrtis dem 
Stamme der Uvularieen näher steht als die Gattung Uvularia . 
Die übereinstimmenden morphologischen und anatomischen 
Merkmale lassen die knolligen Uvularieen als die höher organi¬ 
sierten gegenüber den rhizomtragenden erkennen. 
F. Gericke (Halle). 
Lawson, A. A., The Gametophy tes, Fertiliz ation and Em¬ 
bryo of Cephalotaxus drupacea. (Annals of Botany XXI. p. 1. 1907.) 
At the time of pollination the microspore consists only of the 
tube cell and generative cells; vestigial cells or nuclei representing 
vegetative prothallial cells are entirely lacking. The division of the 
generative cell gives rise to stalk-nucleus and body-cell; the nucleus 
of the latter divides into two sperm nuclei of equal size. There are 
generally four archegonia, each with two, or more rarely three, 
neck cells. A ventral canal-nucleus is formed, which degenerates 
before fertilization. The entire contents of the pollen tube enter the 
egg. By repeated division of the fusion nucleus sixteen nuclei are 
organised before the formation of cell walls. The cells of the embryo 
are eventually arranged in four tiers, — the end tier forming the 
penetrating cap, the second tier the embryo proper, the third the 
suspensors, and the uppermost the rosette. When the primary sus- 
pensors have reached their full length their function is continued 
by a series of secondary suspensors which are developed from the 
proximal cells of the embryo. 
The author concludes, as the result of comparing the gameto¬ 
phy tic structure of Cephalotaxus with that of other Gymnosperms, 
that the genus represents a very recent type of conifer. 
A. Robertson. 
Lawson, A. A., The Gametophytes and Embryo of the 
Cupressineae with special reference to Librocedrus decurrens. 
(Annals of Botany. Vol. XXI. p. 281. 1907.) 
From investigations on the pollen of Taxodium, Cryptomeria, 
Thuja , Librocedrus, Chamaecyparis, Cupressus, and Juniperus it 
seems that the microspores of the Cupressineae are characterized 
by the absence of vestigial prothallial cells or of nuclei representing 
such cells. The number of megaspore mother-cells formed may vary 
from one to three, each of which divides twice. Only one of the 
resulting megaspores germinates. The archegonia vary in number 
from six or eight to twenty-four, and are always grouped closely 
