. Bulletin of the British Museum (Natural History). Botany; Botany. lOjim Fig. 23 Nigropuncta rugulosa (IMI 241409—holotype). A, Conidiogenous cells and detail of pycnidial wall. B, Conidiogenous chain with developing conidia. C, Cells squashed from the irregular multicellular conidia. outer part composed of 2-5 irregular layers of loosely to moderately compacted interwoven hyphae, hyphae thick-walled, hyaline, 2*5-3 jum wide, inner part comprising thinner-walled mainly isodiametric loosely packed pseudoparenchymatous cells, 2—3*5 jum diam, these scarcely distinguishable from conidiophores. Co
. Bulletin of the British Museum (Natural History). Botany; Botany. lOjim Fig. 23 Nigropuncta rugulosa (IMI 241409—holotype). A, Conidiogenous cells and detail of pycnidial wall. B, Conidiogenous chain with developing conidia. C, Cells squashed from the irregular multicellular conidia. outer part composed of 2-5 irregular layers of loosely to moderately compacted interwoven hyphae, hyphae thick-walled, hyaline, 2*5-3 jum wide, inner part comprising thinner-walled mainly isodiametric loosely packed pseudoparenchymatous cells, 2—3*5 jum diam, these scarcely distinguishable from conidiophores. Conidiophores forming a compact layer lining the inner wall of the pycnidial cavity, simple or sparsely branched, arranged ± parallel to one another, hyaline, septate, 10-15 x 2—3*5 //m, composed of almost isodiametric cells, somewhat constricted at the septa. Conidiogenous cells holothallic, integrated, terminal, determinate, subglobose to subcylindrical, resembling the conidiophore cells but sometimes becoming olivaceous at the apex, 3^ jum wide. Conidia arising in short basipetal chains, tightly adhering to those produced from adjacent conidiogenous cells to form multicellular propagules, these very irregular in shape but mainly 20^0 jum overall, deep olive to almost black, extruded through the ostiolar opening as a dense black cirrhus which is clearly seen with a x 10 lens, individual cells mainly simple, thick-walled, subglobose to angular through compression by adjacent cells, walls roughened with a very irregular granular-lacerate ornamentation, this perhaps originating from exfoliating layers of wall tissue, cells mainly 6-8 //m diam. Host: On an unidentified sterile grey areolate crustose lichen thallus. The areolae are not discoloured in any way and algal cells close to the pycnidia retain their usual colour also. The species is evidently parasymbiotic rather than parasitic, but could even be lichenized (see below). Distribution: Austria. Known only from the type
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Keywords: ., bookauthorbritishmuseumnatur, bookcentury1900, booksubjectbotany
