ZOOLOGY AND BOTANY, MICROSCOPY. ETC. 311 



The former is caused by the conidial stage of a fungus named by Massee 

 Trichosphsera Sacchari, * to which, however, various other names have 

 been given. The only reproductive form of importance is the Melan- 

 conium stage producing stylospores. The root-disease is due to a con- 

 dition of the same fungus (Colletotrichum falcatum Went) modified by 

 being more or less buried in the ground. 



A. Howard f describes at length culture experiments on the same 

 fungus in its Melanconium, megaconidial, and microgonidial stages ; the 

 ascigerous stage he has not yet succeeded in cultivating. 



Structure of the Lower Fungi.! — Commenting on the observations 

 of Wager § with regard to the presence of a nucleus in yeast, M. Guil- 

 liermond finds similar granulations to those described by him, in 

 moulds, especially in a species of Dematium, their presence being associ- 

 ated with a comparative absence of glycogen. They have, however, 

 nothing to do with the true nucleus, which closely corresponds in 

 structure to that of the higher Ascomycetes. Both in yeasts (Saccharo- 

 myces cerevisise) and in moulds the true nucleus is composed of a 

 nucleoplasm surrounded by a membrane, in which are a number of 

 granulations, one of which, larger and more regular than the rest, may 

 be the nucleole. 



Development of Terfezia.|| — In the neighbourhood of Rome Ter- 

 fezia leonis, an underground fungus belonging to the Tuberacese, has 

 long been known only in close proximity to Helianthemum guttalum. 

 R. Pirotta and A. Albini find that peculiar appendages to the root of 

 this plant are infested with a mycorhizal mycele which is in organic 

 connection with the receptacles of the Terfezia. 



New Fungus Pathogenic to Tylenchus agrostidis.1T — G. Lagerheim 

 describes galls found on Tylenchus agrostidis (Steinb.) Bast., which were 

 filled with a homogeneous yellow mass consisting of bacterium-like 

 organisms. The air-dried cecidia are flask-shaped, and much larger than 

 the normal fruit of the plant. All the fruit-buds of diseased plants 

 were converted into galls, and in most instances no nematodes were 

 observed. The interior of the cecidium is horny and yellow, and con- 

 sists of numberless small branched forms. From the existence of true 

 branching the parasite is a fungus, probably belonging to the genus 

 Actinomyces. 



The yellow pigment is a lipochrome. 



Mycetozoa. 



Type-Specimens of Myxomycetes.** — Dr. W. C. Sturgis gives a 

 very useful description of 27 out of the 33 species of Myxomycetes 

 originally described by Prof. Peck, from personal examination of the 

 type-specimens preserved in the New York State Museum at Albany. 



* Cf. this Journal, 1894, p. 380. t Tom. cit., pp. 617-32. 



X Comptes Rendus, cxxxii. (1901) pp. 175-8. 

 § Cf. this Journal, 1899, p. 312. 



|| Rend. R. Accad. Lincei, 1900, 8 pp. See Bot. Ztg., lix. (1901) 2 U Abt., p. 6. 

 4 Bihang till k. svenska Vetenskaps Akad. Handlingar, 1900, xxvi. Afd. iii. 

 No. 4, 21 pp. (1 pi. and 7 figs.). See Bot. Centralbl., lxxxv. (1901) pp. 282-3. 

 ** Trans. Connecticut Acad. Arts and Sci., x. (1900) pp. 463-90 (2 pis.). 



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