10 FUNGI PARASITIC 1'1'ON AI.KYKODKS CITRI. 



II. ASCHERSONIA ALEYRODIS WEBBER. 



This species was first discovered by H. J. Webber in August, 18913, at 

 Crescent City, in the grove of J. H. Harp. Mr. Webber 12 published a pre- 

 liminary notice of the entomogenous nature of this fungus in 1894, referring 

 it to Aschcrsonia tahitcnsis Mont. In 189(5, under the same name, he 

 mentions it in the bulletin, "The Principal Diseases of Citrus Fruits in 

 Florida". 1:I Finding it after further study to be a distinct species, he de- 

 scribed it in 1897 in his bulletin, "Sooty Mold of the Orange and its Treat- 

 ment," as Aschcrsonia alcyrodis,' 14 as follows: 



.Ischcrsonia alcyrodis Webber. Stroma hypophyllous, depressed hemispherical, 

 pinkish buff or cream colored, coriaceous, 1 2Vmm. in diameter ; mycelial hypothallus 

 grayish white, forming a thin membrane closely adhering to the leaf and extending 

 about 1 mm. beyond the stroma ; perithecia membranaceons, at first superficial, later 

 becoming immersed, irregular, reniform or orbicular in mature specimens, and opening 

 by small, round, or elliptical pores or slits; basidia crowded, filiform, slender, con- 

 tinuous, 28 40 microns long, 0.94 1.5 in diameter; paraphyses abundant, slender, 

 projecting beyond the basidia, 65 100 microns long, y 1 micron in diameter; spor- 

 ules fusiform, continuous, mucilaginous, hyaline, sometimes obscurely 3 4 guttulate, 

 9.4 14.1 microns long by 0.94 1.88 microns wide, very abundant and erumpent, form- 

 ing conspicuous coral red or rufus masses. (Parasitic on Alcyrodcs citri R. & H. infest- 

 ing citrous leaves in Florida). 



HISTORY. 



Some species of Aschersonia have been reported to be conidial stages of 

 the genus Hypocrella, an Ascomycete. Massee 13 speaks of having shown 

 that the ascigerous forms of species of Aschersonia were produced on fallen 

 leaves on which the conidial stages had grown. Parkin 10 also mentions this 

 genus as the probable perfect stages of species of Aschersonia and refers 

 to a species of Hypocrella (H. Raciborskii) described by Zimmerman, 17 

 with a conidial stage referable to Aschersonia. No ascigerous forms have 

 as yet been discovered in connection with the Aschersonias in Florida. 



In I'.KI."), F. S. Earle ls reported Aschcrsonia alcyrodis on Alc\rodes 

 citri in Cuba. In I'.MM;. J. Parkin 10 reported finding an Aschersonia on sev- 

 eral undetermined species of Aleyrodes in Ceylon, which closely resembled 

 Aschcrsonia alcyrodis. He said, "Numerous forms of Aschersonia have 

 been found in Ceylon on species of Aleyrodes and Lecanium". In February, 

 I'.Kis. Cook and Home 20 reported Aschcrsonia alcvrodis on .llcvrodcs citri 

 and on Ale\rodes howardi'i, in Cuba. 



"Webber, H. J. Journal of Mycology, V<>1. VI, No. 4, p. :;<;:;. \ 



13 WeblK-r, II. J. Div. of Veg. Phys. & Path., Bui. s, p . ;_>;. Washington I) C L896 

 "Webber, H. J. Div. ,,f YY-. Phys. & Path.. I'.ul. L3, p. 21, Washington I") C*. ls7 

 "Massee, G. Jour. Hot. V>1. 34, i. 151. 

 10 Parkin, J. Ann. Roy. Bot. Card. IVradtniya. V.>1. III. Part 1 pp <) and 3> I'.MII, 



17 Zimmerman. Central!), fiir I'.akt.. Abth. II. Vol. VII. p. 872. 



18 Primer Informe Anual de la Estarion Central . \-ronoinica <lr Cuba 1WM and l')<r> 



p. 169, I'.ioii. 



"Annals Roy. Bot. Card. P< radnm a. Vol. III. Pan I. p. ;;;. l<t<m. 

 "Cook, M. 'l\. and llornr. \\'. T. Cuban K\p. Sta. P.nl. ( .i. p. :;l. 1908. 



