196 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
23 figs.). A revised edition of the classification of the difficult group 
of the Hymenophyllacese, published by the late R. B. van den Bosch, 
enriched with numerous notes and drawings left by that expert at his 
death in 1862. Descriptions are given of genera and sub-genera, and 
where necessary of species, with synonymy and references to literature, 
also distribution and collectors’ names and cxsiccataMiumbers. The 
present instalment treats of the following genera of Trichomanoidese : — 
Gardiomanes, Feea, Neuromanes , Cephalomanes, Trichomanes (sub-genera : 
Gonocormus and Micro gonium). • A. G. 
Synopsis Hymenophyllacearum. — R. B. van den Bosch and W. A. 
Goddijn ( Mededeelingen Rijks Herbarium Leiden , 1919, No. 38, 41, 
22 figs.). This instalment, the second, treats of the genus Trichomanes j 
(sub-genera: Ptilophyllum , Craspedoneuron , Grepido manes). A. G. 
Bryophyta. 
Illustrations of Six Species of Riccia, with the Original 
Descriptions.— Caroline C. Haynes {Bull. Torrey Bot. Club , 1920, 
47, 279-87, 6 pis.). Good drawings of the following North American 
species of Riccia , which have never previously been adequately figured : — 
R. Donnellii, R. dictyospora, R. Beyrichiana , R. arvensis , R. hirta , j 
R. Gurtisii. With them are published in full the original descriptions, I 
some of which are difficult of access, also data as to distribution and 
synonymy. R. Beyrichiana Hampe (1838) has for synonym R. Lescuriana ] 
Austin (1863). R. Gurtisii James (1869) was originally described as 
the type of a new genus, Cryptocarpus Austin (1864), afterwards changed 1 
by Lindberg to Thallocarpus. A. Gepp. 
Researches on the Marchantiese. — Robert Douin {Revue Gen. I 
de Botanique, 1921, 33, 34-62, 99-145, 190-213, 16 pis. 45 figs.). A j 
fresh study of the morphology of the Marchantiese, treating of the ! 
growing point, the ramification, the development of the reproductive | 
apparatus, and proposing a new classification founded on constant j 
characters. The author shows that the growing point is a single cell, J 
and not a group of cells. He explains the ramification of the thallus, : | 
and shows that the types of ramification are very varied, some of them i 
having escaped the observation of students : for example, that of 
“ bifurcation contrariee,” as in Peltolepis, Sauteria and Exormotheca. I 
Incidentally he has detected the true origin of the male and female 1 
apparatus, and shows that the female apparatus, as well as the peduncled 
male apparatus, is not a mere prolongation of the thallus, but always 
springs from a special vegetative point arising above or below the 
growing point of the thallus. He finds that the archegonia are 
terminal only in the involucrate Marchantiese, which are thus the only 
acrogenous forms. Also the pedunculate apparatus, both male and 
female, is more complicated than had been generally supposed, owing 
to the presence of a small basilar thallus which has hitherto escaped 
notice. Further, the so-called involucres which protect the sporogonia 
have very different morphological origins. In the Marchantiese 
inferiores they have a thalline structure, but not so in the Marchantiese 
