Mycelia stelrilia, Uhizoctonia, 1175 



litt. "Weinm. — Sparsa, conferta, globosa, regularis, magmtudine 

 capitis aciculte majoris; cortice candido, sub lente ruguloso; nucleo 

 conformi, fusco, intus pallido. 



Hah. in liorto cassareo Pawiowskiensi ad folia putrida Alni 

 incanae inter nives liquescentes (Weinmann), in Lapponia et 

 Norvegia (Sommerfelt). 



RHIZOCTONIA DC. Fl. fr. VI, p. 111 (Etym. rhiza radix et ctoneo 

 occido), Tul. F. hypog. p. 188, Tuheris spec. Bull. Cli. p. 81, 

 Thanatophytum Nees Syst. Myc. p. 148, 1817. — Difformis, varia, 

 concrescens, cartilagineo-carnosa, intus similaris; cortice tenuissimo 

 membranaceo inseparabili persistente; fibris radiciformibus, bysso- 

 ideis, ex angulis fasciculatim emissis, plura individua conjungen- 

 tibus. Fructificatio nulla perspicua. — Fungi subterranei, libere 

 evoluti, super radices plantarum vivarum incumbentes easque ene- 

 cantes, aestivales v. auctumnales, sat persistentes, valde noxii. Ad 

 Sclerotia subterranea prbpe accedunt. 



1. Bhizoctonla vioiacea Tul. Fungi Hypogsei p. 188, Rh. Crocorum 47^8 

 DC; Rh. Medicaginis DC; Rh. Asparagi Fuck., Rh. Solani Kuhn 

 Krankh. d. Gr. p. 224, Thanafophytum Crocorum Nees; Tuber Groci 

 Duby; Sclerotium Crocorum 'Pers. yTuher parasiticum Bull. — Hy- 

 phis subterraneis, intra corticem et lignuni serjoentibus, in mem- 

 branam vel' in fasciculos irregulares coalitis, rarius in glomerulos 

 varia magnitudine , peiithecia ludentes, coactis, rubro-violaceis ; 

 fructificatione propria nulla.. 



Hah. in radicibus Grocorum, Medicaginum, Trifoiio- 

 rum, Solani tuberosi, Asparagi, Citrorum etc., quas 

 enecat, in Gallia, Italia, Helvetia, G-ermania etc. Variat coiore ru- 

 fescente in Crocis, purpureo violaceo in Medicagine etc. 



2. Rhizoctoma Batatas Fr. Elench. II, p. 45, Schw. Syn. N. A. F. 4769 

 n. 2396. — Testacea, torulosa, ex a,picibus fiiamenta exserens. 



Hab. ad terram ex corticibus corruptis, Bethlehem Amer. bor. 

 Affinis Rh. violoAiece sed abunde diversa. Forma varia, tnberi- 

 b"U5 pluribaS concatenatis torulosa, quasi articulata, radicibus Stach. 

 palustris similis, lanceolata, oblonga etc, 12-15 mm. ai;tingens. Ex- 

 tU8 ievis, glabra, testaceo-pallens, intus carnosa, alba, parce ramosa, 

 e& apicibus egressa, primitus distincta et in tubera sensim turge- 

 scentia, demum evanescentia. Interdum refert tubera ConvolvuU 

 Batatce. 

 '3. Rhizoctonia Placenta Schw. Syn. N. A. F. n.'2399. — Fibriiiis 4770 



