Morphologie und Teratologie. 173 



HuMPHREV, H. B., D e velopemen t of Fossombronia lon^iseta Aust. 

 (Annais of Botany. Vol. XX. No. LXXVll. 1906.' p. 83—108. 

 With plates V and VI and eight figures.) 



The germinating spore gives rise to a germ-tube of considerable 

 length which contains a few chlorophyll-bodies and numerous oil- 

 globules, the latter diminishing in number as the growth proceeds. 

 Segmentation shows Variation and may take place very early ; 

 rhizoids develope late and are at first colourless, but later on become 

 viuous purple. A Fungus occurs, confined almost wholly to the 

 Stern and rhizoids and often occupying tuberous svvellings in the 

 former. The apex of each leaf lobe terminates in a single smaller 

 cell void of Chlorophyll granules but containing oil bodies and a 

 mucilaginous fluid. These cells strongly resemble mucilage hairs 

 and probably have a similar function. The plants can undergo great 

 dessication without injury and, on being moistened, they quickly 

 revive; developing sex organs exist through the dry period. 



The antheridium mother cell, after cutting off a basal cell, divides 

 once horizontally and then twice vertically, the upper cell forming 

 the stalk. In its developement the antheridium somewhat resembles 

 Geofhallns and Sphaerocarpns. No centrosomes were found at any 

 stage during spermatogenesis. The spermatid mother cell divides 

 diagonally giving rise to tvvo spermatids, between which no wall is 

 formed. Blepharoplasts arise de novo in the cytoplasm and migrate 

 to one of the poles of the spermatid and later develope cilia. A 

 „Nebenkörper", similar to that described by Ikeno in Marchantia, 

 appears in the cytoplasm and passes towards the pole occupied by 

 the blepharoplast. It elongates and appears to connect up the cyto- 

 plasm and the blepharoplast, thus forming the middle piece of the 

 spermatozoid. The mature spermatozoid forms a spiral of about one 

 and one-half turns. 



The archegonial developement agrees with that of the other 

 Hepaticae; five neck canal cells are present and the egg bears a 

 well-defined receptive spot. The first division of the embryo forms 

 two nearly equal cells; the epibasal portion divides separating the 

 capsule and seta initials, while the hypobasal cell divides horizontally 

 and gives rise to the foot. The next two divisions are vertical and 

 divide every initial except the lowest into four cells; later on peri- 

 clinal divisions go on in the upper part and cut off the wall from the 

 archesporial quadrants. The archesporial cells divide rapidly forming, 

 ultimately, elater initials and spore-mother cells. No centrospheres 

 were found during the mitoses of the sporogenous cells; the spore 

 mother cell wall constricts at four opposite points and the nucleus 

 assumes an equi-fourangled form. The tetrads of spores separate 

 before rupture of the capsule wall. M. Wilson (Glasgow). 



SvEDELius, Über das postflorale Wachstum der Kelch- 

 blätter einiger ConvolviUaceen. (Flora. Bd. XCVI. 1906. 

 p. 230—259. Mit 31 Textfig.) 



Charakteristisch bei den hier beschriebenen Fällen ist, dass der 

 Wasserkelch als solcher nur während des Fruchtstadiums funktioniert, 

 was auch mit einem mehr oder weniger ausgeprägten postfloralen 

 Zuwachs der Kelchblätter zusammenhängt. Am eingehendsten wird 

 Stictocardia tilliaefolia (Choisy) H. Hallier behandelt. Die Blüten- 

 knospen waren nicht wasserhaltig weder vor noch während der 

 Anthese. Nach dem Abfallen der Krone fangen die Kelchblätter an 

 sich zu schliessen und gleichzeitig zu wachsen. Der Kelch ist dann 



