Chcetomium.] FUNGI. 327 



do not feel any hesitation, in accordance with my own views, in consider- 

 ing several of his species, of most of which I have authentic specimens 

 before me, as mere forms of E. commuhis. 



4. E. tortUis, Lk. {tortuous Erysipht) ; flocci brown loose 

 regularly interwoven, fulcra very long turned upwards tortuous 

 simple at the apex, peridiola many. 



On the under side of living leaves of Cornus sangiiinea. Thorn- 

 haugh, &c.. Norths. Rev. M. J. Berkeley, ^The fulcra turn upwards 

 after they are given oft' from the peridium. I have not been able to 

 verify the character of the flocci of the thallus decussating at right 

 angles. 



5. E. penicilldta, Schlecht. {pencilled Erysiphe) ; flocci grey- 

 ish-dirty-white forming effused spots densely interwoven, fulcra 

 pencilled at the apex, peridiola many. Lk. I. c. p. 113. Fr, 

 Sijst. Myc. V. 3. p. 243. I)es77i. ! exs. {var. Berberidis) n, 519. 

 — ^. Berberidis, Grev. FL Ed. p. 460.— E. Lonicerce, I. c. 



jt?. 461. 



On the living leaves of various low shrubs. On Gooseberry. Appin. 

 Cajitain Carmichael. On Barberry and Honeysuckle. Dr. Greville. 

 On Viburnum Opulus. Dr. Hooher.— ln this very intere.-,tmg species 

 the fulcra scarcely exceed the diameter of the periduun, are quite 

 straight and curiously pencilled or flagelliform at the apex, with short 

 slightly flexuous and* somewhat divided filaments. 



6. E. bic6r7iis, Lk. {forked Erysiphe) ; flocci milk-white 

 clensely woven into a close pellicle, fulcra very short forked and 

 nodose at the apex, peridiola many. Lk. I. c. p. 1 1*2. Fr. Syst, 

 Myc. V. 3. p. 244 E. Aceris, Grev. FL Ed.]). 461. 



On the leaves of Maple and Sycamore. Extremely common, often 

 rendering a whole maple hoarv, by which the trees producing it are 

 known at some distance. On the fc^ycamore the thallus ib lur less 

 copious. 



7. E. adunca, Schlecht. {hook-tipped Erysiphc) ; flocci very 

 delicate white woven into an eftuse nearly even spot, flocci very 

 long inflcxed hooked and doubled back at the tip, peridia per- 

 sistent, peridiola many. Lk. I. c. p.\\\. Grev.! Sc. CrypL 

 FL t. i>96. Baxt. i Ox. n. 95. Fr. Syst. Myc. v. 3. j). 245. 



On leaves of Willows, Poplars, &c. Common. — A specimen from 

 Persoon of jMucur Erysiphc is the present species on Poplar. 



8. /:. guttata, Schlecht. {bulbous-haired Erysiphc) ; flocci 

 wliite loose interwoven subevanesceiit, fulcra bulbous elevating 

 the peridia which at length are open and subdiscoid, peridiola 

 many erumpent. Lk. L c. p. 1 16. Baxt. ! Ox. u. 96. Fr. 

 Si/st.Mt/v. V. 3. p. 24G.—E. Coryli, Moug. ^' Nest.! u. 83 — E. 

 Betnla,' Grev. FL Ed. p. 460. 



On leaves of larger shrubs and trees. Very common on Hnsef. 

 — Easily distinguished when mature by the bulhcnis bases v( ihcjlucci. 



104. Cn.KToMiuM. Kunzc. Cha'tomium. 



Peridium membranaceous, clotlied with liairs which spring 



