Search on : Taxa descriptions


Page number:55 
Description type:Non-original description 
Description:Ophiostoma piceae (Munch) H. & P. Sydow - Fig. 21

Ceratostomella piceae Münch - Naturw. Z. Forst- u. Landw. 5: 547. 1907 Ophiostoma piceae (Münch) H. & P. Sydow - Annls mycol. 17: 43. 1919 = Ceratocystis piceae (Münch) Bakshi - Trans. Br. mycol. Soc. 33: 113. 1950.
Ceratostomella fagi Loos - Arch. Mikrobiol. 3: 376. 1932 = Ophiostoma fagi (Loos) [p. 56] Melin & Nannf. - Svensk SkogsvFör. Tidskr. 32: 408. 1934 = Ceratocystis fagi (Loos) C. Moreau - Revue Mycol., Suppl. Colon. 17: 22. 1952.
Ceratostomella catoniana Goidànich - Atti Accad. naz. Lincei Re., Ser. 6, 21: 199. 1935 = Ophiostoma catonianum (Goidànich) Goidànich - Boll. Staz. Patol. veg. Roma, N. Ser., 15: 132. 1935 = Ceratocystis catoniana (Goidànieh) C. Moreau - Revue Mycol., Suppl. Colon. 17: 22. 1952.
Ophiostoma floccosum Mathiesen - Svenska bot. Tidskr. 45: 219. 1951 = Ceratocystis floccosa (Mathiesen) Hunt - Lloydia 19: 36. 1956.
Status conidialis: Graphium pirinum Goidànich - Boll, Staz. Patol. veg. Roma, N. Ser., 15: 132. 1935.
Hyalodendron pirinum Goidànich - Boll. Staz. Patol. veg. Roma, N. Ser., 15: 136. 1935.
Pesotum piceae Crane & Schoknecht - Am. J. Bot. 60: 348. 1973.

Colonies in vitro attaining a diameter of 14-22 mm in 10 days, floccose or lanose, rather flat, occasionally remaining smooth, often locally with tufts of Graphium-like synnemata; at first white, later often becoming greyish or pale brownish, or with blackish zones or sectors by abundant formation of synnemata or perithecia. Reverse uncoloured or pale greyish [p. 57] brown. Some hyaline exudate may be present; odour absent. Submerged hyphae hyaline, occasionally pale brown, smooth-walled, thin- or some-times slightly thick-walled, 1-3(-4.5) µm wide. Aerial hyphae, if present, thinner than the submerged hyphae, loose or slightly fasciculate. Conidiogenous cells scattered, arising orthotropically from undifferentiated hyphae, often also in terminal position or integrated in short side branches, subcylindrical to linear, variable in shape and size, usually widest in the basal region and slightly tapering towards the tip, mostly about 30-50 µm long, about 1.5-2.5 µm wide in the basal part, in the aerial mycelium usually somewhat narrower; apical part forming conidia by sympodial growth, consisting of a not or slightly swollen (up to 3.5 µm) cluster of conidium-bearing denticles; denticles cylindrical, rather robust, usually 0.7-1.5 µm long. The conidiogenous cell often proliferates at or somewhat below the apex, by which the first formed conidia become scattered alongside the apical region of the conidiogenous cell; after formation of the first cluster of denticles it may give rise to another cluster or a conidiogenous cell, which in turn may become intercalary. Conidia hyaline, smooth- and thin-walled, fusiform, with a pointed base, continuous; conidia of first order rarely one-septate, mostly about 8-15 x 2-2.8(-3.5) µm, usually giving rise to one or several short series of smaller, secondary conidia. When older hyaline, rather thin-walled, subglobose or obovate lateral blastoconidia (about 2.5-4 µm in diameter) may be present. In fresh isolates light to mid brown synnemata of about 500 µm high are present, widened apically to a hymeniform layer of linear, sympodial conidiogenous cells, producing slimy masses of subhyaline, oblong conidia, 3-5.5 x 2-2.5 µm, which slightly taper towards the truncate base. A description of the synnematal state is provided by Munch (1907, as Ceratostomella piceae), Goidànich (1935, as Graphium pirinum), Crane & Schoknecht (1973, as Pesotum piceae) and others.
Taxon name: