334 
SUMMARY OF CURRENT RESEARCHES RELATING TO 
fungus, morphologically a Trichophyton, and obtained from sycosis of 
the beard, when inoculated on the human skin, set up suppuration, and 
that the affected area was bestudded with small sulphur-yellow cups, 
having the naked eye and microscopical characters of favus cups. Sub- 
cultures showed resemblance to the pyogenic Trichophyton of the horse. 
The same fungus inoculated on two mice produced typical favus cups. 
These cups are less invasive than those of human or canine favus. The 
authors contend that their observations prove that the barriers between 
Trichophyton and Achorion are less absolute than are supposed. 
Protophyta. 
a. Schizophycese- 
Curvatures and Structure of the Membrane in the Schizophy- 
ceae.* — Fresh observations by Herr E. Kolkwitz do not enable him to 
confirm in all points the account given by Correns of the curvature of 
the lower Algte. The curvatures are not spontaneous, but are the result 
of contact. The phenomena already described in the Oscillatoriaceee 
are presented also in Beggiatoa mirahilis. The foulness of the water in 
which Beggiatoa habitually grows causes it to coil up into a ball. 
"With regard to the nature of the membrane (in Oscillatoria maxima ), 
the author finds it to exhibit fine punctations, which he believes to be of 
the same nature as that in Gloeocapsa , and to be due to a granular structure. 
New Genera of Protococcoideae.f — Among the results of the first 
Eegnell expedition, Herr K. Bohlin describes the following new genera 
of Protococcoideae : — 
Echallocystis g. n. Thallus macroscopicus, viridis, stratum efficiens; 
cellulae oblongae, in divisione membrana cellulae maternae dehiscens ; 
cellulae sororiae ad earn se fingentes excreto mucoso, interstitium conicum 
cellulorum explente : amylum adest. Placed under Tetrasporeae. 
Pilidiocystis g. n. Alga viridis, cellulis ovoideis, membrana ex maxima 
parte tenuis, incolorata, sed ad angustiorem partem cellulae incrassata, 
umbonem rubellum efficiens, ad partem latiorem cellulae tuberculo 
minimo, stipitem unum v. duos ferente, instructa ; pyrenoidibus singulis 
in angustiore parte cellulae ; amylum adest ; propagatio 2-4-partitione 
contentus cellularis ; cellulis filiis solutione membranae totius maternae, 
umbono rubello excepto, liberatis. Near Oocystis and Lagerheimia. 
Selenoderma g. n. Alga viridis, thallo mucoso macroscopico, cellulis 
late lunatis, irregulariter in muco dispositis ; chlorophoris singulis 
parietalibus, pyrenoidibus singulis instructis ; propagatio 2-4-partitione 
cellularum ; alii modi propagations ignoti. Near Kirchneriella. 
Thermal Algae. % — Miss Josephine E. Tilden enumerates the algae 
(Schizophyceae) collected from several warm springs in the United 
states and in Canada. They include a number of new forms, and two 
new species, Microspora Weedii and Spirulina caldaria. 
New Plankton-Forms.§ — M. B. Schroder describes in detail the 
composition of the plankton of the Oder, in which he finds the following 
* Ber. Deutsch. Bot. Geeell., xv. (1897) pp. 460-7 (1 ph). Cf. this Journal, 1897, 
p. 324. 
t Bih. k. Svensk. Vetensk. Akad. Handl., xxiii. (1897) 47 pp. and 2 pis. 
% Bot. Gazette, xxv. (1898) pp. 89-105 (3 pis.). 
§ Ber. Deutsch. Bot. Gesell., xv. (1897) pp. 482-92. 
