QUARTERLY CHRONICLE OF MICROSCOPICAL SCIENCE. 301 



mycelium have passed into them. From these sporidia 

 (before they have become separated from the pro-mycelium) 

 tlie elone^atcd c^erminating filaments are developed, the pro- 

 toplasm <jra(lually accunmlating towards the growing apex, 

 which becomes separated by a septum from the posterior 

 part. Both sporidia and germinating filaments have the 

 power of penetrating the epidermis to reach the cellular 

 tissue of the host. But when the apex of the filament has 

 penetrated into the interior of a cell, it does not grow free in 

 its cavity, but becomes enclosed by the inner layers of the 

 cell-wall as by a sheath. This sheath shows the ordinary 

 reaction of cellulose, and can often only be recognised by 

 treating the preparation with potash, covering, as it does, every 

 branch of the germinating filament of the parasite as it ramifies. 

 The mycelium of the Urocystis takes from eight to ten 

 weeks to become fully developed. The ends of the filaments 

 then swell greatly, and become filled with protoplasm, but 

 without dividing, the terminal portions of several filaments 

 become closely attached to one another, and form a kind of 

 ball which gradually becomes uniformly filled with a fine- 

 grained protoplasm, containing drops of oil, and enveloped 

 in a membrane. This ball finally develops into the group 

 of spores with its peculiar spore- like appendages, which 

 appear to be the detached apices of other filaments of the 

 mycelium. — A. W. Bennett. 



6. Peniciliium glaucum. — Brefeld gives in ' Flora,^ 1873, 

 p. 331, a short account of the results, fuller detailed in his 

 recently published memoir on this " asexually propagated 

 form of a hitherto unknown species of the group of Asco- 

 mycetesJ" 



Mucor racemosus and Yeast. — Brefeld contributes to 

 ' Flora' (1873, p. 385) a paper on this subject, with some 

 remarks on the systematic arrangement of Fungi. 



7. Protomyces micrusporus, Ung. — In the ' Botanische 

 Zeitung' for February De Bary describes in detail the 

 history of this species. Protomyces macrosporus, Ung., 

 remains the type of a family of doubtful affinity, but P. 

 microsjwrus, now Entyloma Utifferianum, De Bary, is shown 

 to be clearly entitled to a place amongst Ustilaginea. 



III. Lichens. — The literature of the lichen-question has 

 been fully noticed in this Journal. Bornet has added an addi- 

 tional confirmation to the theory which daily gains ground in 

 a note ('Ann. des Sc. Nat.,' 5e ser., xix, p. 314), in which he 

 announces that he has met with cases in which Trentepohlia 

 {Chroolepus, Auct.), which constitutes the gonidia of Ope- 

 grapha, has emerged from the lichen, resumed its normal 



