286 PALEOBOTANY [BoT. Absts., Vol. VII, 



Health 10 : 874-875. 1920. — The claim is made that the production of more than 10 per cent 

 of gas in brilliant-green lactose bile would seem to be no longer a "presumptive," but a 

 "positive" test for B. coli. The medium is composed of 50 grams dried oxgall, 10 grams pep- 

 tone, 10 grams lactose, and 0.1 gram brilliant-green (commercial salt of tetraethyldiamino- 

 triphenyl-carbinol) to 1 liter of water. — C. A. Ludwig. 



MYXOMYCETES 



2002. Elliott, W. T., and Jessie S. Elliott. The sequence of fungi and mycetozoa. 

 Jour. Bot. 58: 273-274. 1920.— See Hot. Absts. 7, Entry 1984. 



2003. Ferdinandson, C, and (3. Winge. Clathrosorus, a new genus of Plasmodio- 

 phoraceae. Ann. Bot. 34: 467-469. 1 pi. 1920. — A description is given of a myxomycete 

 parasitic on the bluebell, Campanula rapunculoides, in Denmark. The cytological features 

 of the parasite are in close agreement with those of the Plasmodiophoraceae. The mature 

 sorus is irregular or rounded, and is traversed by cavities. The individual spores are not so 

 firmly connected as in Sorosphaera. The spores at maturity show a finely punctate, warty 

 membrane, and in this characteristic differ from all other known genera of the Plasmodio- 

 phoraceae. A diagnosis of the new genus and species is given. — W. P. Eraser. 



2004. Lister, Gulielma. Mycetozoa found during the Baslow foray. Trans. British 

 Mycol. Soc. 6: 248-252. 1920. — The myxomycetes found in the vicinity of Baslow, Derby- 

 shire, in September, 1919, are reported with brief notes on the habitats of a number of species. 

 A total of 45 species was collected. — W. B. McDougall. 



PALEOBOTANY AND EVOLUTIONARY HISTORY 



E. W. Berry, Editor 



2005. Bower, F. O. The earliest known land flora. Nature 105 : 681-684, 712-714. 5 fig. 

 1920. — (Discourse delivered at the Royal Institution, Apr. 30.) A review of some general 

 features of Carboniferous and Devonian plants. Description and discussion of Sporogonites, 

 possibly an early Devonian bryophyte; also of Rhynia and Asteroxylon described by Kidston 

 and Lange from the Rhynie chert in Scotland. Psilotaceae, a group of living pteridophytes 

 with imperfect morphological differentiation, is discussed. — 0. A. Stevens. 



2006. Carpentier, A. Notes d'excursions paleobotaniques a Chalonnes et Montjean 

 (Maine-et-Loire). [Notes on paleobotanical collections from Chalonnes and Montjean, Maine 

 and Loire.] Bull. Soc. Geol. France IV, 19: 262-272. PL 7-8. 1920.— From the Devonian 

 schistes of Chalonnes the author records various undeterminable scraps and specimens of 

 Psilophyton spinosum Potonie and Bernard. From the lower Carboniferous (Culm) are 

 recorded Lepidodendron acuminatum, Stigmaria ficoides, Pinnularia mollis, Archaeocala- 

 mites scrobiculatus, Sphenopteris hochstetteri, Sphenopteris schimperiana {?), Archaeopteris 

 pachyracha and Pteridorachis. From the Lower Carboniferous of Montjean are recorded 

 Archaeocalamites scrobiculatus, Paleoastachya, Lepidodendron selaginelloides , Lepidophyllum 

 lanceolatum, Ulodendron minus, Sphenopteris elegans, Sphenophyllum tenerrimum, Sphenop- 

 teris dissecta, Zeilleria moravica. Aster ophyllites, Dactylotheca aspera, Pecopteris plumosa, 

 Lepidostrobus variabilis, Calymmatotheca andegavensis and Telangium affine. — E. W. Berry. 



2007. Church, A. H. Thallassiophyta and the sub-aerial transmigration. Oxford Bot. Mem. 

 3. 95 p. 1919. — A speculation on the origin of land plants. The author considers that life 

 originated through the action of radiant energy acting on ionized sea water on a gradually cool- 

 ing earth. The first stage of life is termed the Plankton stage. With the shallowing of the 

 supposed universal primeval ocean and the approach of the bottom within the influence of the 

 sunlight the second, or Benthonic stage, was inaugurated. During this long continued stage of 

 evolution a great variety of marine life was differentiated including all of those structures that 



