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On the Structure, Ecology and Distribution of the Species of Mitrula S.Lat

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On the Structure, Ecology and Distribution of the Species of Mitrula S.Lat On the structure, ecology and distribution of the species of Mitrula s.lat. (Ascomycetes, Geoglossaceae) Esteri Kankainen The Subarctic Research Station of the University of Turku, Turku. Finland Introduction the notes of KALLIO & KANKAINEN ( 1964, 1966) are also plotted on the maps (Figs. 1, The matter under consideration is a part 3). of my research including the larger fungi in I express my best thanks. for direction and arctic and subarctic regions. For eight years I advice of great value to my teacher Prof. Paa­ have also collected Mitrula material, and so­ vo Kallio, for valuable notes and discussion me notes are published in KALLIO & KANKAI­ to Phil. lie. Tauno Ulvinen, for determinat­ NEN (1964, 1966 ). I have had the opportunity ion of the mosses in question to Phil. mag. to participate on the excursions of Kevo, the Unto Laine, and for the linguistic revision to Subarctic Research Station of the University Mrs. Linna Miiller-Wille. I have received of Turku under the leadership of Prof. Paavo financial support from Suomen. Kulttuurira­ Kallio. Our Mitrula collections from these hasto. trips to Spitsbergen in 1966 and northeastern Mit r u l a Fr., Syst. Myc. 1, p. 491. 1821. Canada in 1967 are taken into consideration (sensu strict.) in the present paper. The specimens studied lMAI ( 1941 ) and MAAS GEESTERANUS are preserved in the following herbariums: ( 1964) have unravelled the history of the genus Mitrula, and we only ascertain the lar­ H Botanical Museum of the Univer­ ge variation in its content from one extreme sity of Helsinki to the other, from the wide opinion of HFR Finnish Forest Research Institute, KARSTEN ( 1871) and MASSEE ( 1897) to the Helsinki narrow one of IMAI (1941, 1956) and MAAS HPP Department of Phytopathology, GEESTERANUS ( 1964). IMAI ( 1956), divided University of Helsinki Geoglossaceae into new subfamilies. and tribes. KEVO Collections of the Subarctic Re­ Consequently the tribe Mitruleae includes search Station of the University of only one monotypic genus Mitrula on. the Turku, Utsjoki basis of that the ascocarp of M . paludosa is OULU Botanical Museum of the Univer­ hemiangiocarpic. In the tribe Gymnomitru­ sity of Oulu leae is included one genus Gymnomitrula s Botanical Museum of Stockholm with two species G. abietis and G. gracilis TROMS Department of Botany, Troms0 on the basis of that the ascocarp of M . pusilla Museum is gymnocarpic. According to MAAs GEESTE­ TUR Botanical Museum of the Univer­ RANUS ( 1964) the genus Mitrula is also mo­ sity of Turku notypic. He has renewed the old genus Only unpublished finds are included in the H eyderia which is in his opinion monotypic, enclosed lists of the studied specimens, but because the place of M. gracilis is indistinct. 23 In the present paper we have taken the genus cylindrical-spherical cap is pure yellow in Mitrula in a larger sense than the last two colour ( cf. var. cylindrica of VELENOVSKY authors, but sensu stricto compared with the 1934). opinion of e.g. FRIES (1821), NANNFELDT The ascigerous portion is connected to the ( 1942) and EcKBLAD ( 1963). stem without a sterile margin as seen in Mit­ rula gracilis and Heyderia abietis. The cap­ 1. Mitrula paludosa Fr., Sy.st. Myc. 1, p. stem relation varies very much depending on 491. 1821. the habitat. In very rotten, soft places the Helvella laricina Viii., Fl. Dauph. 3, p. 1045, Tab. 56. 1786-1789. specimens have thick, short, caespitose stems Clavaria phalloides Bull., Champ. France, p. and small caps ( cf. var. pachyceps of KAR­ 214, Tab. 463, Fig. 3. 179·1-179-8. STEN 1883); on a more solid substrate the Clavaria epiphylla Dicks., Plant. Crypt. 3, p. 22, stems grow slender and long, the height of Tab. 9, Fig. 10. 1793. Leotia ludwigii, dicksoni, bulliardi Pers., Syn. them depending on the depth of the substrate Fung., pp. 611, 612, Tab. 3, Fig. 13. 1801. in the water. The caps are generally large Leotia laricina ·Pers., Syn. Fung., p. 614. 1801. and variable in form. H elvella aurantiaca C.umino, Act. A cad. Sci. Tour., p. 221. 1805. Anatomy. The width of the hyphae in the Mitrula aurantia Cumino, Fung. Vall. Pi<>ii in central part of the stipe widens up to 15 fl, Act. Tur. 1806. Leotia uliginosa Pers., Myc. Eur. 1, p. 200. in the periphery of the stipe about 6 fl· The 1822. surface of the stem is smooth. Leotia uliginosa var. aurantiaca .Pers., Ibid., p. The size of the asci averages 75- 110 X 5 201. 1822 . - 6 fl (measured in five specimens). The Mitrula pha:lloides Ghev., Fl. Paris, p. 114, Fig. 185. 1826-1827. paraphyses are straight, not at all or very Leotia elegans Berk., London Journ. Bot. 5, p. 6. slightly enlarged above. The spores are hya­ 1846. line, not punctate, nonseptate, cylindrical to Mitrula elegans Fr., Nov. Symb. Myc., p. 103·. clavate-cylindrical, in average larger than 1851. Mitrula paludosa var. pachyceps Karst., Hedw. those in M. gracilis. The size of the spores in 22, p. 17. 1883. -Karst., Acta Soc. F. Fl. Fenn. the following specimens is: Masku 4. 6. 1959 2, p. 110. 1885. 15.3 X 3.5 fl (50 measurement); Lohja 12. Mitrula phalloides var. pa:chyc('ps Sacc., Syll. 6. 1961 12.2 X 2.5 fl (50 meas.); Kiirninki Fung. 8, p. 33. 1889. Microglossum elegans Underw., Minn. Bot. Stud. 25. 6. 1966 13.7 X 2.6 fl (50 meas.); Inari 1, p . 495. 1>896. 15. 7. 1968 11.1 X 2.6 fl (30 meas.). MitrulGJ laricina Mass., Ann. Bot. 11, p. 271. The morphological and anatomical features 1897. of the specimens studied correspond well with Mitrula norvegica Rostr., Vid.-Selsk. Skrift. 1: 4, p. 5. 1904. those recorded in the literature (FRIES 1821, Mitrula phalloides var. aurantiaca Boud., Icon. KARSTEN 1871, 1883, REHM 1896, MASSEE Myc. 3·, Tab. 427. 1909. 1897, DuRAND 1908, LLOYD 1916, VELENovsKv External morphology. The size and fo-rm 1934, IMAI 1941, MAINS 1955, BENEDIX 1962, of the studied ascocarps of Mitrula paludosa EcKBLAD 1963, MAAS GEESTERANUS 1964) . are quite variable. The stipe is 2-5 centimet­ Specimens belonging to var. p.achyceps Karst., res high, smooth, transparent, whitish when and possibly to var. sphaerocephala Boud. fresh, orange yellow when dry. The base of and var. cylindrica Vel. are included in the the stem is generally thickened when grown list of the studied specimens. Var. castanea in soft habitat, for instance in mud, forming Vel. is unknown to us as is f. pallens Eisfelder a large white ball of hyphae. When growing & Benedix. MAINS ( 1955, p. 873) has found on only a little decayed leaves the base of three types of ascospmes occurring in the the stem is not at all thickened or very Mitrula paludos.a collections. We have found, slightly. however, spores of very variable fo·rm and The diameter of the ascigerous portion va­ size in the same specimen. The uniseptate ries from 0.5 to over one centimetre. Mostly spores are very rare in our collections ( cf. the cap is uneven, folded, but also even, al­ MASSEE 1897, lMAI 1941, MAINS 1955). most spherical caps exist. Sometimes the caps Habitat. Mitrula paludosa grows in Fin­ resemble Spath ularia. The colour of the cap is land preferably on decaying leaves of birch, yellow - orange yellow when fresh becoming but it is also found on leaves of Alnus, on far darker when dried. The form with even, needles and twigs of Pinus silvestris and Picea 24 abies, and among more rotten rests of plants writer are mostly from Finland (see Fig. 1). (in mud and slime) . Almost without excep­ The species has never been found in the alpi­ tion the species is found along springs and ne regions of Lapland, thus above the Betula spring brooks, and in bogs. Often its habitat tortuosa tree limit. In other parts of Finland is a puddle, but always a place where the wa­ it seems to be common. Many collections ter changes but does not flow. In such places and observations have been made along the the oxygen conditions are good. The habitat Salpausselka ridges. The species is common of our specimen collected in Canada was on this area because of the occurrence of very similar to those in Lapland. springs at the foot of the ridges. The habitats o.f the studied specimens agree Mitrula paludosa occurs in all of Europe with the notes presented in the literature (SACCARDO 1889, IMAI 1941, BENEDIX 1962), (FRIES 1821, KARSTEN 1871, 1883, CooKE in Greenland (LANGE 195 7), North America 1871, REHM 1896, MAssEE 1897, DuRAND (DURAND 1908, MAINS 1955 ), Japan (IMAI 1908, LLOYD 1916, VELENOVSKY 1934, biAI 1941 ), that is to say only in the northern 1941, NANNFELDT 1942, MAINS 1955, BENEDIX hemisphere. EcKBLAD (1963, p. 153 ) has also 1962) . Var. pachyccps of KARSTEN ( 1883 ) noticed that this species does not occur above is grown «Supra acus Pini sylvestris putres­ the tree limit. He says that «<n southern Nor­ centes«. It is not yet understood, whether way it shows a slight tendency to coastal the caespitose form is caused by the quality distribution«. Maybe the greater elevation of of the substrate and/ or only by the softness the inner parts of Norway leads to the afore­ of it. BENEDIX ( 1962, p. 402) presents four said distribution. «Varietaten« sphaerocephala Boud., pachy­ ceps Karst., castanea Vel. and cylindrica Vel. List of the specimens studied (marked with only as habitat forms. dots on the enclosed map, Fig. 1) : FINLAND Phenology. Mitrula paludosa is earlier AI. Eckero Storby 17.6.1956 L.E.Kari than M. gracilis, occurring from spring to (TUR); L em Ian d Slatskar 7.
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